fix: merge 30 general improvements from release branch

Bug fixes:
- Detached context for GetAccountConcurrencyBatch (prevent all-zero on request cancel)
- Filter soft-deleted users in GetByGroupID
- Stripe CSP policy (allow Stripe.js in script-src and frame-src)
- WebSearch API key validation on save
- RECHARGING status in payment result success check
- Windows test fixes (logger Sync deadlock, config path escaping)

Feature enhancements:
- Webhook multi-instance dispatch (extractOutTradeNo + GetWebhookProvider)
- EasyPay mobile H5 payment (device param + PayURL2)
- SSE error propagation in WebSearch emulation
- AccountStatsCost DTO field for admin usage logs
- Plans sort by sort_order instead of created_at
- UsageMapHook for streaming response usage data
- apicompat Instructions field passthrough
- EffectiveLoadFactor for ops concurrency/metrics
- Usage billing RETURNING balance for notify system
- BulkUpdate mixed channel warning with details
- println to slog migration in auth cache
- Wire ProviderSet cleanup
- CI cache-dependency-path optimization

Frontend:
- Refund eligibility check per provider (canRequestRefund)
- Plan sort_order editing
- Dead code cleanup (simulate_claude_max, client_affinity)
- GroupsView platform switch guard
- channels features_config API type
- UsageView account_stats_cost export

backend/cmd/server/wire.go

@@ -36,19 +36,13 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 		// Business layer ProviderSets
 		repository.ProviderSet,
 		service.ProviderSet,
+		payment.ProviderSet,
 		middleware.ProviderSet,
 		handler.ProviderSet,
 
 		// Server layer ProviderSet
 		server.ProviderSet,
 
-		// Payment providers
-		payment.ProvideRegistry,
-		payment.ProvideEncryptionKey,
-		payment.ProvideDefaultLoadBalancer,
-		service.ProvidePaymentConfigService,
-		service.ProvidePaymentOrderExpiryService,
-
 		// Privacy client factory for OpenAI training opt-out
 		providePrivacyClientFactory,