新增 Expo 与 Tauri 原生宿主壳

新增 HostBridge 原生宿主契约和 H5 native_app transport

新增 Expo React Native 移动壳并收紧 WebView 外链边界

新增 Tauri 桌面壳并用 capability 收口受控命令

更新宿主壳方案、文档索引和共享记忆

packages/shared/src/contracts/hostBridge.ts

@@ -0,0 +1,106 @@
+export const HOST_BRIDGE_PROTOCOL = 'GenarrativeHostBridge';
+export const HOST_BRIDGE_VERSION = 1;
+
+export type HostShellKind = 'browser' | 'wechat_mini_program' | 'native_app';
+
+export type NativeHostShell = 'expo_mobile' | 'tauri_desktop';
+
+export type NativeHostPlatform =
+  | 'ios'
+  | 'android'
+  | 'macos'
+  | 'windows'
+  | 'linux'
+  | 'unknown';
+
+export type HostBridgeMethod =
+  | 'host.getRuntime'
+  | 'auth.requestLogin'
+  | 'payment.request'
+  | 'share.setTarget'
+  | 'share.open'
+  | 'navigation.openNativePage'
+  | 'app.openExternalUrl'
+  | 'clipboard.writeText'
+  | 'haptics.impact';
+
+export type HostBridgeCapability =
+  | HostBridgeMethod
+  | 'host.events'
+  | 'navigation.canGoBack';
+
+export type HostBridgeRuntimeResult = {
+  shell: NativeHostShell;
+  platform: NativeHostPlatform;
+  hostVersion: string | null;
+  bridgeVersion: number;
+  capabilities: HostBridgeCapability[];
+};
+
+export type HostBridgeRequest<Payload = unknown> = {
+  bridge: typeof HOST_BRIDGE_PROTOCOL;
+  version: typeof HOST_BRIDGE_VERSION;
+  id: string;
+  method: HostBridgeMethod;
+  payload?: Payload;
+  timeoutMs?: number;
+};
+
+export type HostBridgeError = {
+  code:
+    | 'invalid_request'
+    | 'unsupported_method'
+    | 'unsupported_capability'
+    | 'timeout'
+    | 'cancelled'
+    | 'host_error';
+  message: string;
+};
+
+export type HostBridgeResponse<Result = unknown> = {
+  bridge: typeof HOST_BRIDGE_PROTOCOL;
+  version: typeof HOST_BRIDGE_VERSION;
+  id: string;
+} & (
+  | {
+      ok: true;
+      result?: Result;
+    }
+  | {
+      ok: false;
+      error: HostBridgeError;
+    }
+);
+
+export type HostBridgeEvent<Payload = unknown> = {
+  bridge: typeof HOST_BRIDGE_PROTOCOL;
+  version: typeof HOST_BRIDGE_VERSION;
+  event: string;
+  payload?: Payload;
+};
+
+export type NavigateNativePagePayload = {
+  url: string;
+};
+
+export type OpenExternalUrlPayload = {
+  url: string;
+};
+
+export type ClipboardWriteTextPayload = {
+  text: string;
+};
+
+export type HapticsImpactPayload = {
+  style?: 'light' | 'medium' | 'heavy';
+};
+
+export type ShareSetTargetPayload = {
+  target: unknown;
+};
+
+export type ShareOpenPayload = {
+  title?: string;
+  message?: string;
+  url?: string;
+};