diff --git a/apps/desktop-shell/scripts/check-config.mjs b/apps/desktop-shell/scripts/check-config.mjs
index 76fad6a59..c50fbac83 100644
--- a/apps/desktop-shell/scripts/check-config.mjs
+++ b/apps/desktop-shell/scripts/check-config.mjs
@@ -53,6 +53,11 @@ const desktopHostBridgeDispatchSource = fs.readFileSync(
   desktopHostBridgeDispatchPath,
   'utf8',
 );
+const desktopShellUrlPath = new URL(
+  '../src-tauri/src/shell/url.rs',
+  import.meta.url,
+);
+const desktopShellUrlSource = fs.readFileSync(desktopShellUrlPath, 'utf8');
 const productionSourceRoots = [
   new URL('../package.json', import.meta.url),
   new URL('../src-tauri/Cargo.toml', import.meta.url),
@@ -932,6 +937,10 @@ const sharedHostBridgeVersion = extractTsNumberConst(
   sharedContractSource,
   'HOST_BRIDGE_VERSION',
 );
+const sharedPublicWebOrigin = extractTsStringConst(
+  sharedContractSource,
+  'HOST_BRIDGE_PUBLIC_WEB_ORIGIN',
+);
 const sharedHostBridgePayloadLimits = {
   HOST_BRIDGE_REQUEST_ID_MAX_LENGTH: extractTsNumberConst(
     sharedContractSource,
@@ -1041,6 +1050,10 @@ const desktopHostBridgeVersion = extractRustNumberConst(
   rustHostSource,
   'HOST_BRIDGE_VERSION',
 );
+const desktopPublicWebOrigin = extractRustStringConst(
+  desktopShellUrlSource,
+  'WEB_APP_ORIGIN',
+);
 const desktopCapabilities = extractDesktopCapabilities(
   desktopHostBridgeCapabilitiesSource,
 );
@@ -1060,6 +1073,12 @@ if (desktopHostBridgeVersion !== sharedHostBridgeVersion) {
   );
 }
 
+if (desktopPublicWebOrigin !== sharedPublicWebOrigin) {
+  throw new Error(
+    `desktop shell public web origin drifted: expected ${sharedPublicWebOrigin} but got ${desktopPublicWebOrigin}`,
+  );
+}
+
 for (const [limitName, sharedLimit] of Object.entries(
   sharedHostBridgePayloadLimits,
 )) {
diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index 975536e94..b09b14e08 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -489,6 +489,14 @@ const sharedHostBridgeVersion = extractNumberConstExport(
   sharedContractSource,
   'HOST_BRIDGE_VERSION',
 );
+const sharedPublicWebOrigin = extractStringConstExport(
+  sharedContractSource,
+  'HOST_BRIDGE_PUBLIC_WEB_ORIGIN',
+);
+const sharedPublicWebUrl = extractStringConstExport(
+  sharedContractSource,
+  'HOST_BRIDGE_PUBLIC_WEB_URL',
+);
 const handledMobileMethods = extractMobileBridgeHandledMethods(dispatchSource);
 const mobileCapabilities = extractStringArrayExport(
   hostBridgeSource,
@@ -926,16 +934,11 @@ if (
   );
 }
 
-if (
-  !urlSource.includes(
-    "DEFAULT_MOBILE_SHELL_WEB_URL = 'https://app.genarrative.world/'",
-  )
-) {
-  throw new Error('mobile shell default H5 URL must point to the production web app');
-}
-
 for (const snippet of [
-  "ALLOWED_PRODUCTION_WEB_ORIGIN = 'https://app.genarrative.world'",
+  'HOST_BRIDGE_PUBLIC_WEB_ORIGIN',
+  'HOST_BRIDGE_PUBLIC_WEB_URL',
+  'DEFAULT_MOBILE_SHELL_WEB_URL = HOST_BRIDGE_PUBLIC_WEB_URL',
+  'ALLOWED_PRODUCTION_WEB_ORIGIN = HOST_BRIDGE_PUBLIC_WEB_ORIGIN',
   'LOCAL_DEVELOPMENT_WEB_HOSTS',
   "'127.0.0.1'",
   "'localhost'",
@@ -947,6 +950,23 @@ for (const snippet of [
   }
 }
 
+for (const localWebOriginDuplicate of [
+  `DEFAULT_MOBILE_SHELL_WEB_URL = '${sharedPublicWebUrl}'`,
+  `ALLOWED_PRODUCTION_WEB_ORIGIN = '${sharedPublicWebOrigin}'`,
+]) {
+  if (urlSource.includes(localWebOriginDuplicate)) {
+    throw new Error('mobile shell public web origin must come from shared HostBridge contract');
+  }
+}
+
+if (!webViewPolicySource.includes('DEFAULT_MOBILE_SHELL_WEB_URL')) {
+  throw new Error('mobile shell WebView policy must use the shared default H5 URL');
+}
+
+if (webViewPolicySource.includes(`'${sharedPublicWebUrl}'`)) {
+  throw new Error('mobile shell WebView policy must not duplicate the public web URL');
+}
+
 for (const snippet of [
   'ALLOWED_PRODUCTION_WEB_ORIGIN',
   'normalizePublicShareUrl',
diff --git a/apps/mobile-shell/src/shell/url.test.ts b/apps/mobile-shell/src/shell/url.test.ts
index 7827bc16a..f26b053b0 100644
--- a/apps/mobile-shell/src/shell/url.test.ts
+++ b/apps/mobile-shell/src/shell/url.test.ts
@@ -1,6 +1,10 @@
 import { describe, expect, test } from 'vitest';
 
-import { HOST_BRIDGE_VERSION } from '../../../../packages/shared/src/contracts/hostBridge';
+import {
+  HOST_BRIDGE_PUBLIC_WEB_ORIGIN,
+  HOST_BRIDGE_PUBLIC_WEB_URL,
+  HOST_BRIDGE_VERSION,
+} from '../../../../packages/shared/src/contracts/hostBridge';
 import {
   ALLOWED_PRODUCTION_WEB_ORIGIN,
   DEFAULT_MOBILE_SHELL_WEB_URL,
@@ -10,8 +14,8 @@ import {
 
 describe('buildMobileShellUrl', () => {
   test('默认 H5 地址指向真实主站', () => {
-    expect(DEFAULT_MOBILE_SHELL_WEB_URL).toBe('https://app.genarrative.world/');
-    expect(ALLOWED_PRODUCTION_WEB_ORIGIN).toBe('https://app.genarrative.world');
+    expect(DEFAULT_MOBILE_SHELL_WEB_URL).toBe(HOST_BRIDGE_PUBLIC_WEB_URL);
+    expect(ALLOWED_PRODUCTION_WEB_ORIGIN).toBe(HOST_BRIDGE_PUBLIC_WEB_ORIGIN);
   });
 
   test('为 H5 附加原生移动壳上下文', () => {
diff --git a/apps/mobile-shell/src/shell/url.ts b/apps/mobile-shell/src/shell/url.ts
index c8f4c7319..214043dc1 100644
--- a/apps/mobile-shell/src/shell/url.ts
+++ b/apps/mobile-shell/src/shell/url.ts
@@ -1,4 +1,6 @@
 import {
+  HOST_BRIDGE_PUBLIC_WEB_ORIGIN,
+  HOST_BRIDGE_PUBLIC_WEB_URL,
   HOST_BRIDGE_VERSION,
   type HostBridgeCapability,
   type NativeHostPlatform,
@@ -10,8 +12,8 @@ export type MobileShellUrlOptions = {
   capabilities: HostBridgeCapability[];
 };
 
-export const DEFAULT_MOBILE_SHELL_WEB_URL = 'https://app.genarrative.world/';
-export const ALLOWED_PRODUCTION_WEB_ORIGIN = 'https://app.genarrative.world';
+export const DEFAULT_MOBILE_SHELL_WEB_URL = HOST_BRIDGE_PUBLIC_WEB_URL;
+export const ALLOWED_PRODUCTION_WEB_ORIGIN = HOST_BRIDGE_PUBLIC_WEB_ORIGIN;
 const LOCAL_DEVELOPMENT_WEB_HOSTS = new Set([
   '127.0.0.1',
   'localhost',
diff --git a/apps/mobile-shell/src/shell/webViewPolicy.ts b/apps/mobile-shell/src/shell/webViewPolicy.ts
index f070ebc4f..fa4e9b991 100644
--- a/apps/mobile-shell/src/shell/webViewPolicy.ts
+++ b/apps/mobile-shell/src/shell/webViewPolicy.ts
@@ -1,3 +1,5 @@
+import { DEFAULT_MOBILE_SHELL_WEB_URL } from './url';
+
 const MOBILE_WEBVIEW_BLOCKED_DOWNLOAD_PROTOCOLS = new Set([
   'blob:',
   'data:',
@@ -18,7 +20,7 @@ export function shouldBlockMobileWebViewDownloadUrl(
 
   try {
     return MOBILE_WEBVIEW_BLOCKED_DOWNLOAD_PROTOCOLS.has(
-      new URL(rawUrl, 'https://app.genarrative.world/').protocol,
+      new URL(rawUrl, DEFAULT_MOBILE_SHELL_WEB_URL).protocol,
     );
   } catch {
     return false;
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index 81d32b5b7..5a0d0cc84 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -55,6 +55,7 @@
 - 2026-06-18 移动壳启动 URL 归一：Expo 壳的 `EXPO_PUBLIC_GENARRATIVE_WEB_URL` 和 deep link 基准地址只接受生产主站 `https://app.genarrative.world`，以及本机开发联调 `http://127.0.0.1`、`http://localhost`、`http://[::1]`；空值、相对路径、外域、`file:`、`javascript:` 等非法配置回退到默认 H5 地址后再附加 `native_app` 宿主上下文；deep link 仍只映射归一后基准 origin 的 H5 路径，禁止把外域或危险协议页面装进带完整 HostBridge 的 WebView。
 - 2026-06-18 移动壳主动导航上下文：Expo 壳的 `navigation.openNativePage` 与 deep link 都必须复用 `buildMobileShellUrl(...)` 补写 `native_app`、`expo_mobile`、真实平台、版本和 capability 清单；受控导航只接受当前允许 origin 的同源 H5 URL。移动壳配置检查会拒绝主动导航或 deep link 绕过该宿主上下文构造入口。
 - 2026-06-18 移动壳协议常量来源：Expo 壳的 HostBridge 事件注入、入口 URL `bridgeVersion`、`host.getRuntime` 回包和 Expo public config smoke 必须使用 `packages/shared/src/contracts/hostBridge.ts` 的 `HOST_BRIDGE_PROTOCOL` / `HOST_BRIDGE_VERSION`，不得在壳层重新写死协议名或版本字面量；配置检查会拒绝这些常量漂移。
+- 2026-06-19 公开 Web origin 单一来源：原生壳允许加载 / 分享 / 跳转的公开 H5 主站 origin 以 `packages/shared/src/contracts/hostBridge.ts` 的 `HOST_BRIDGE_PUBLIC_WEB_ORIGIN` / `HOST_BRIDGE_PUBLIC_WEB_URL` 为源；Expo 移动壳只能通过 `DEFAULT_MOBILE_SHELL_WEB_URL` / `ALLOWED_PRODUCTION_WEB_ORIGIN` 语义别名引用共享常量，Tauri 桌面壳 `WEB_APP_ORIGIN` 作为 Rust 运行时镜像常量必须由 `apps/desktop-shell/scripts/check-config.mjs` 反查同一共享值。两端不得在分享、WebView policy、启动 URL 或桌面导航里另行复刻 `https://app.genarrative.world` 作为独立真相。
 - 2026-06-18 桌面壳协议常量来源：Tauri Rust 侧 `host_bridge/protocol.rs` 的 `HOST_BRIDGE_PROTOCOL` / `HOST_BRIDGE_VERSION`、桌面入口 URL `bridgeVersion`、HostBridge event 注入和 runtime 回包必须与 `packages/shared/src/contracts/hostBridge.ts` 保持一致；桌面配置检查会反查共享契约并拒绝协议名或协议版本漂移。`tauri.conf.json` 只保留基础入口，`shell/url.rs` 统一补写桌面宿主上下文和真实 capability 清单，配置检查会拒绝把 `hostCapabilities` 等宿主 query 长串重新写回 Tauri 配置。
 - 2026-06-18 移动壳默认入口：Expo 壳默认 H5 地址固定为 `https://app.genarrative.world/`，开发联调本机 Vite 必须显式设置 `EXPO_PUBLIC_GENARRATIVE_WEB_URL=http://127.0.0.1:3000/`、`http://localhost:3000/` 或 `http://[::1]:3000/`；生产包不得在未配置环境变量时加载设备本机 localhost，也不得通过环境变量把第三方外域 H5 放入带完整 HostBridge 的 WebView。
 - 2026-06-18 移动壳安装包身份：Expo 移动壳的 iOS bundle identifier 与 Android package 统一固定为 `world.genarrative.mobile`，应用版本固定为 `0.1.0`，iOS `buildNumber` 从字符串 `"1"` 起步，Android `versionCode` 从整数 `1` 起步；后续分发安装包时递增构建号 / versionCode，产品版本号按发布节奏调整。移动壳配置检查会校验 `app.json` 与 `package.json` 版本一致，并拒绝缺失或漂移的包标识，当前不写入假商店元数据、假更新端点或占位渠道 SDK 配置。
diff --git a/docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md b/docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md
index 9617eb2a3..3b75cc126 100644
--- a/docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md
+++ b/docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md
@@ -326,6 +326,8 @@ GameBridge 禁止：
 
 2026-06-18 追加：移动壳 HostBridge 协议名和协议版本统一从 `packages/shared/src/contracts/hostBridge.ts` 的 `HOST_BRIDGE_PROTOCOL` / `HOST_BRIDGE_VERSION` 读取。Expo 入口 query、WebView 事件注入、`host.getRuntime` 回包和 Expo public config smoke 都必须反查共享常量；移动壳配置检查会拒绝重新写死 `GenarrativeHostBridge` 或字面量版本。
 
+2026-06-19 追加：公开 H5 主站 origin / 默认 URL 统一以 `packages/shared/src/contracts/hostBridge.ts` 的 `HOST_BRIDGE_PUBLIC_WEB_ORIGIN` / `HOST_BRIDGE_PUBLIC_WEB_URL` 为源。移动壳 `DEFAULT_MOBILE_SHELL_WEB_URL` 与 `ALLOWED_PRODUCTION_WEB_ORIGIN` 只是壳层语义别名，分享 URL 归一、WebView 下载协议判定和启动 URL 回退都不得重新写死 `https://app.genarrative.world`；桌面 Rust 侧 `WEB_APP_ORIGIN` 保留为运行时镜像常量，但 `apps/desktop-shell/scripts/check-config.mjs` 必须反查共享 origin。两端配置检查会拒绝本地复刻或漂移同值 origin。
+
 2026-06-18 追加：桌面壳 HostBridge 协议名和协议版本也必须反查同一共享契约。Tauri Rust 侧仍保留 `host_bridge/protocol.rs` 常量作为运行时代码入口，但 `apps/desktop-shell/scripts/check-config.mjs` 会把 Rust `HOST_BRIDGE_PROTOCOL` / `HOST_BRIDGE_VERSION` 与 `packages/shared/src/contracts/hostBridge.ts` 对齐，避免桌面壳事件注入、runtime 回包和 H5 transport 分叉。
 
 2026-06-18 追加：移动壳默认 H5 地址固定为 `https://app.genarrative.world/`。开发联调如需加载本机 Vite，必须显式设置 `EXPO_PUBLIC_GENARRATIVE_WEB_URL=http://127.0.0.1:3000/`、`http://localhost:3000/` 或 `http://[::1]:3000/`；生产包不得在未配置环境变量时默认加载设备本机 localhost，也不得通过环境变量把第三方外域 H5 放入带完整 HostBridge 的 WebView。
diff --git a/packages/shared/src/contracts/hostBridge.test.ts b/packages/shared/src/contracts/hostBridge.test.ts
index 5b8010608..17296db94 100644
--- a/packages/shared/src/contracts/hostBridge.test.ts
+++ b/packages/shared/src/contracts/hostBridge.test.ts
@@ -1,6 +1,8 @@
 import { describe, expect, test } from 'vitest';
 
 import {
+  HOST_BRIDGE_PUBLIC_WEB_ORIGIN,
+  HOST_BRIDGE_PUBLIC_WEB_URL,
   HOST_BRIDGE_TAURI_COMMAND,
   isHostBridgeMethod,
   isHostBridgeCapability,
@@ -17,6 +19,11 @@ import {
 } from './hostBridge';
 
 describe('HostBridge shared contract helpers', () => {
+  test('固定公开 H5 主站入口', () => {
+    expect(HOST_BRIDGE_PUBLIC_WEB_ORIGIN).toBe('https://app.genarrative.world');
+    expect(HOST_BRIDGE_PUBLIC_WEB_URL).toBe('https://app.genarrative.world/');
+  });
+
   test('固定 Tauri 只暴露唯一 HostBridge command', () => {
     expect(HOST_BRIDGE_TAURI_COMMAND).toBe('host_bridge_request');
   });
diff --git a/packages/shared/src/contracts/hostBridge.ts b/packages/shared/src/contracts/hostBridge.ts
index 1adb65a80..0db9ce1ee 100644
--- a/packages/shared/src/contracts/hostBridge.ts
+++ b/packages/shared/src/contracts/hostBridge.ts
@@ -1,6 +1,8 @@
 export const HOST_BRIDGE_PROTOCOL = 'GenarrativeHostBridge';
 export const HOST_BRIDGE_VERSION = 1;
 export const HOST_BRIDGE_TAURI_COMMAND = 'host_bridge_request';
+export const HOST_BRIDGE_PUBLIC_WEB_ORIGIN = 'https://app.genarrative.world';
+export const HOST_BRIDGE_PUBLIC_WEB_URL = 'https://app.genarrative.world/';
 
 export type HostShellKind = 'browser' | 'wechat_mini_program' | 'native_app';