revert: remove fork-only changes from release sync

Revert payment/wechat, sora/claude-max cleanup, fork-only migrations,
and cosmetic changes that were brought in by the release sync commit.
Keep only channel-monitor related improvements:
- PublicSettingsInjectionPayload named struct with drift test
- ChannelMonitorRunner graceful shutdown in wire
- image_output_price in SupportedModelChip
- Simplified buildSelfNavItems in AppSidebar
- Gateway WARN logs for 503 branches

frontend/vitest.config.ts

@@ -13,7 +13,6 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'jsdom',
-    setupFiles: ['src/__tests__/setup.ts'],
     include: ['src/**/*.{test,spec}.{js,ts,jsx,tsx}'],
     exclude: ['node_modules', 'dist'],
     coverage: {