merge: 合并 test 分支到 test-dev，解决冲突

解决的冲突文件：
- wire_gen.go: 合并 ConcurrencyService/CRSSyncService 参数和 userAttributeHandler
- gateway_handler.go: 合并 pkg/errors 和 antigravity 导入
- gateway_service.go: 合并 validateUpstreamBaseURL 和 GetAvailableModels
- config.example.yaml: 合并 billing/turnstile 配置和额外 gateway 选项

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/internal/setup/setup.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/Wei-Shaw/sub2api/internal/infrastructure"
+	"github.com/Wei-Shaw/sub2api/internal/repository"
 	"github.com/Wei-Shaw/sub2api/internal/service"
 
 	_ "github.com/lib/pq"
@@ -269,7 +269,7 @@ func initializeDatabase(cfg *SetupConfig) error {
 
 	migrationCtx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
 	defer cancel()
-	return infrastructure.ApplyMigrations(migrationCtx, db)
+	return repository.ApplyMigrations(migrationCtx, db)
 }
 
 func createAdminUser(cfg *SetupConfig) error {