feat(tls-fingerprint): 新增 TLS 指纹 Profile 数据库管理及代码质量优化

新增功能：
- 新增 TLS 指纹 Profile CRUD 管理（Ent schema + 迁移 + Admin API + 前端管理界面）
- 支持账号绑定数据库中的自定义 TLS Profile，或随机选择（profile_id=-1）
- HTTPUpstream.DoWithTLS 接口从 bool 改为 *tlsfingerprint.Profile，支持按账号指定 Profile
- AccountUsageService 注入 TLSFingerprintProfileService，统一 usage 场景与网关的 Profile 解析逻辑

代码优化：
- 删除已被 TLSFingerprintProfileService 完全取代的 registry.go 死代码（418 行）
- 提取 3 个 dialer 的重复 TLS 握手逻辑为 performTLSHandshake() 共用函数
- 修复 GetTLSFingerprintProfileID 缺少 json.Number 处理的 bug
- gateway_service.Forward 中 ResolveTLSProfile 从重试循环内重复调用改为预解析局部变量
- 删除冗余的 buildClientHelloSpec() 单行 wrapper 和 int64(e.ID) 无效转换
- tls_fingerprint_profile_cache.go 日志从 log.Printf 改为 slog 结构化日志
- dialer_capture_test.go 添加 //go:build integration 标签，防止 CI 失败
- 去重 TestProfileExpectation 类型至共享 test_types_test.go
- 修复 9 个测试文件缺少 tlsfingerprint import 的编译错误
- 修复 error_policy_integration_test.go 中 handleError 回调签名被错误替换的问题

backend/internal/handler/wire.go

@@ -30,33 +30,35 @@ func ProvideAdminHandlers(
 	usageHandler *admin.UsageHandler,
 	userAttributeHandler *admin.UserAttributeHandler,
 	errorPassthroughHandler *admin.ErrorPassthroughHandler,
+	tlsFingerprintProfileHandler *admin.TLSFingerprintProfileHandler,
 	apiKeyHandler *admin.AdminAPIKeyHandler,
 	scheduledTestHandler *admin.ScheduledTestHandler,
 ) *AdminHandlers {
 	return &AdminHandlers{
-		Dashboard:        dashboardHandler,
-		User:             userHandler,
-		Group:            groupHandler,
-		Account:          accountHandler,
-		Announcement:     announcementHandler,
-		DataManagement:   dataManagementHandler,
-		Backup:           backupHandler,
-		OAuth:            oauthHandler,
-		OpenAIOAuth:      openaiOAuthHandler,
-		GeminiOAuth:      geminiOAuthHandler,
-		AntigravityOAuth: antigravityOAuthHandler,
-		Proxy:            proxyHandler,
-		Redeem:           redeemHandler,
-		Promo:            promoHandler,
-		Setting:          settingHandler,
-		Ops:              opsHandler,
-		System:           systemHandler,
-		Subscription:     subscriptionHandler,
-		Usage:            usageHandler,
-		UserAttribute:    userAttributeHandler,
-		ErrorPassthrough: errorPassthroughHandler,
-		APIKey:           apiKeyHandler,
-		ScheduledTest:    scheduledTestHandler,
+		Dashboard:             dashboardHandler,
+		User:                  userHandler,
+		Group:                 groupHandler,
+		Account:               accountHandler,
+		Announcement:          announcementHandler,
+		DataManagement:        dataManagementHandler,
+		Backup:                backupHandler,
+		OAuth:                 oauthHandler,
+		OpenAIOAuth:           openaiOAuthHandler,
+		GeminiOAuth:           geminiOAuthHandler,
+		AntigravityOAuth:      antigravityOAuthHandler,
+		Proxy:                 proxyHandler,
+		Redeem:                redeemHandler,
+		Promo:                 promoHandler,
+		Setting:               settingHandler,
+		Ops:                   opsHandler,
+		System:                systemHandler,
+		Subscription:          subscriptionHandler,
+		Usage:                 usageHandler,
+		UserAttribute:         userAttributeHandler,
+		ErrorPassthrough:      errorPassthroughHandler,
+		TLSFingerprintProfile: tlsFingerprintProfileHandler,
+		APIKey:                apiKeyHandler,
+		ScheduledTest:         scheduledTestHandler,
 	}
 }
 
@@ -145,6 +147,7 @@ var ProviderSet = wire.NewSet(
 	admin.NewUsageHandler,
 	admin.NewUserAttributeHandler,
 	admin.NewErrorPassthroughHandler,
+	admin.NewTLSFingerprintProfileHandler,
 	admin.NewAdminAPIKeyHandler,
 	admin.NewScheduledTestHandler,