接入原生壳应用角标能力

新增 HostBridge app.setBadgeCount 契约和 H5 能力门控

Expo 壳按平台声明能力并在 iOS 调用系统角标 API

Tauri 壳通过主窗口设置任务栏角标并校验 payload

补齐角标能力测试、漂移检查和架构文档

src/services/host-bridge/hostBridge.test.ts

@@ -25,6 +25,7 @@ import {
   requestWechatMiniProgramPhoneLogin,
   resetHostRuntimeCacheForTest,
   resolveHostRuntime,
+  setHostAppBadgeCount,
   setHostAppTitle,
   setHostShareTarget,
   subscribeHostRuntimeChange,
@@ -443,6 +444,7 @@ describe('hostBridge', () => {
         'haptics.impact',
         'app.openExternalUrl',
         'app.setTitle',
+        'app.setBadgeCount',
         'share.open',
         'file.exportImage',
       ]),
@@ -477,6 +479,7 @@ describe('hostBridge', () => {
     await expect(setHostAppTitle({ title: ' 拼图 - 陶泥儿 ' })).resolves.toBe(
       true,
     );
+    await expect(setHostAppBadgeCount({ count: 7 })).resolves.toBe(true);
     await expect(
       openHostShare({
         title: '暖灯猫街',
@@ -544,6 +547,14 @@ describe('hostBridge', () => {
         },
       }),
     });
+    expect(invoke).toHaveBeenCalledWith('host_bridge_request', {
+      request: expect.objectContaining({
+        method: 'app.setBadgeCount',
+        payload: {
+          count: 7,
+        },
+      }),
+    });
     expect(invoke).toHaveBeenCalledWith('host_bridge_request', {
       request: expect.objectContaining({
         method: 'share.open',
@@ -611,6 +622,9 @@ describe('hostBridge', () => {
       false,
     );
     await expect(setHostAppTitle({ title: '   ' })).resolves.toBe(false);
+    await expect(setHostAppBadgeCount({ count: 1 })).resolves.toBe(false);
+    await expect(setHostAppBadgeCount({ count: -1 })).resolves.toBe(false);
+    await expect(setHostAppBadgeCount({ count: 1.5 })).resolves.toBe(false);
     await expect(
       openHostShare({
         title: '暖灯猫街',