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。

apps/web/app/utils/yunlefunSsoConfig.ts

@@ -9,8 +9,6 @@ export interface YunlefunSsoConfigInput {
   clientId?: string
   cloudbaseEnv?: string
   exchangeUrl?: string
-  nativeClientId?: string
-  nativeRedirectUri?: string
   redirectUri?: string
   redirectUris?: string | string[]
   scope?: string
@@ -19,7 +17,6 @@ export interface YunlefunSsoConfigInput {
 
 export interface YunlefunSsoConfigContext {
   currentOrigin: string
-  platform: 'native' | 'web'
 }
 
 export interface YunlefunSsoConfig {
@@ -39,22 +36,18 @@ export function resolveYunlefunSsoConfig(
   input: YunlefunSsoConfigInput,
   context: YunlefunSsoConfigContext,
 ): YunlefunSsoConfigResult {
-  const clientId = readSsoClientId(
-    context.platform === 'native' ? input.nativeClientId : input.clientId,
-  )
+  const clientId = readSsoClientId(input.clientId)
   const cloudbaseEnv = normalizeValue(input.cloudbaseEnv)
   const exchangeUrl = readSsoRedirectUri(input.exchangeUrl)
   const webRedirectUris = readWebRedirectUris(input.redirectUris ?? input.redirectUri)
-  const redirectUri = context.platform === 'native'
-    ? readSsoRedirectUri(input.nativeRedirectUri)
-    : webRedirectUris.find(uri => new URL(uri).origin === context.currentOrigin)
+  const redirectUri = webRedirectUris.find(uri => new URL(uri).origin === context.currentOrigin)
   const scope = readSsoScope(input.scope)
   const ssoOrigin = normalizeHttpsOrigin(input.ssoOrigin)
 
   if (!clientId
     || !CLOUDBASE_ENV_RE.test(cloudbaseEnv)
     || !exchangeUrl
-    || (context.platform === 'native' ? !redirectUri : webRedirectUris.length === 0)
+    || webRedirectUris.length === 0
     || scope.length === 0
     || !ssoOrigin) {
     return {