sync: bring over remaining release/custom-0.1.115 changes

- Extract PublicSettingsInjectionPayload named struct with drift test
- Add channel_monitor_default_interval_seconds to SSR injection
- Add image_output_price to SupportedModelChip
- Simplify AppSidebar buildSelfNavItems (admins see available channels)
- Add gateway WARN logs for 503 no-available-accounts branches
- Wire ChannelMonitorRunner into provideCleanup for graceful shutdown
- Add migrations 130/131 (CC template userid fix + mimicry field cleanup)
- Clean up fork-only features (sora, claude max simulation, client affinity)
- Remove ~320 obsolete i18n keys
- Add codexUsage utility, WechatServiceButton, BulkEditAccountModal
- Tidy go.sum

frontend/src/__tests__/setup.ts

@@ -36,6 +36,22 @@ class MockResizeObserver {
 
 globalThis.ResizeObserver = MockResizeObserver as unknown as typeof ResizeObserver
 
+// Mock matchMedia (jsdom doesn't implement it).
+// Default matches=true so desktop viewport queries pass and components that
+// only lazy-load on mobile render content immediately in tests.
+if (typeof window !== 'undefined' && !window.matchMedia) {
+  window.matchMedia = (query: string): MediaQueryList => ({
+    matches: true,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn()
+  }) as MediaQueryList
+}
+
 // Vue Test Utils 全局配置
 config.global.stubs = {
   // 可以在这里添加全局 stub