refactor: 只保留 Web，移除 Capacitor 原生壳

删除 android/、ios/ 两个 Capacitor 原生工程与 capacitor.config.ts、
ionic.config.json，以及 scripts/android、scripts/ios.sh 构建脚本；
根与 apps/web 的 @capacitor/* 依赖和相关 npm scripts 一并移除。

Web 侧去掉原生分支：登录只走云乐坊容器授权面板或顶层重定向，
暗色模式不再改原生状态栏，移除 Android 物理返回键处理。

保留 @nuxtjs/ionic（Web UI 框架）、云乐坊 window.ylf 桥接与 PWA。

决策记录见 docs/decisions/0004-web-only.md。

test/yunlefunAuth.test.ts

@@ -31,8 +31,6 @@ describe('yunlefun auth controller', () => {
     const identity = fakeIdentityAdapter()
     const controller = createYunlefunAuthController({
       identity,
-      native: fakeAuthorizationAdapter(),
-      platform: 'web',
       web,
     })
 
@@ -46,29 +44,17 @@ describe('yunlefun auth controller', () => {
     expect(identity.adopted).toEqual([authorization])
   })
 
-  it('opens the platform-appropriate authorization surface', async () => {
+  it('opens the web authorization surface', async () => {
     const web = fakeAuthorizationAdapter()
-    const native = fakeAuthorizationAdapter()
-    const webController = createYunlefunAuthController({
+    const controller = createYunlefunAuthController({
       identity: fakeIdentityAdapter(),
-      native,
-      platform: 'web',
-      web,
-    })
-    const nativeController = createYunlefunAuthController({
-      identity: fakeIdentityAdapter(),
-      native,
-      platform: 'native',
       web,
     })
 
-    await webController.signIn()
-    await nativeController.signIn()
+    await controller.signIn()
 
     expect(web.started).toBe(1)
-    expect(native.started).toBe(1)
-    expect(webController.snapshot().status).toBe('signing-in')
-    expect(nativeController.snapshot().status).toBe('signing-in')
+    expect(controller.snapshot().status).toBe('signing-in')
   })
 
   it('adopts a host authorization without leaving the current page', async () => {
@@ -76,8 +62,6 @@ describe('yunlefun auth controller', () => {
     const identity = fakeIdentityAdapter()
     const controller = createYunlefunAuthController({
       identity,
-      native: fakeAuthorizationAdapter(),
-      platform: 'web',
       web,
     })
 
@@ -95,8 +79,6 @@ describe('yunlefun auth controller', () => {
     const identity = fakeIdentityAdapter(account)
     const controller = createYunlefunAuthController({
       identity,
-      native: fakeAuthorizationAdapter(),
-      platform: 'web',
       web: fakeAuthorizationAdapter(),
     })
     await controller.initialize()
@@ -119,8 +101,6 @@ describe('yunlefun auth controller', () => {
     }
     const controller = createYunlefunAuthController({
       identity,
-      native: fakeAuthorizationAdapter(),
-      platform: 'web',
       web: fakeAuthorizationAdapter(),
     })
     await controller.initialize()
@@ -133,22 +113,6 @@ describe('yunlefun auth controller', () => {
       status: 'error',
     })
   })
-
-  it('adopts an authorization delivered after the native app resumes', async () => {
-    const identity = fakeIdentityAdapter()
-    const controller = createYunlefunAuthController({
-      identity,
-      native: fakeAuthorizationAdapter(),
-      platform: 'native',
-      web: fakeAuthorizationAdapter(),
-    })
-    await controller.initialize()
-
-    await controller.handleAuthorization(authorization)
-
-    expect(identity.adopted).toEqual([authorization])
-    expect(controller.snapshot().status).toBe('signed-in')
-  })
 })
 
 function fakeAuthorizationAdapter(