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/ent/intercept/intercept.go

@@ -23,6 +23,7 @@ import (
 	"github.com/Wei-Shaw/sub2api/ent/redeemcode"
 	"github.com/Wei-Shaw/sub2api/ent/securitysecret"
 	"github.com/Wei-Shaw/sub2api/ent/setting"
+	"github.com/Wei-Shaw/sub2api/ent/tlsfingerprintprofile"
 	"github.com/Wei-Shaw/sub2api/ent/usagecleanuptask"
 	"github.com/Wei-Shaw/sub2api/ent/usagelog"
 	"github.com/Wei-Shaw/sub2api/ent/user"
@@ -466,6 +467,33 @@ func (f TraverseSetting) Traverse(ctx context.Context, q ent.Query) error {
 	return fmt.Errorf("unexpected query type %T. expect *ent.SettingQuery", q)
 }
 
+// The TLSFingerprintProfileFunc type is an adapter to allow the use of ordinary function as a Querier.
+type TLSFingerprintProfileFunc func(context.Context, *ent.TLSFingerprintProfileQuery) (ent.Value, error)
+
+// Query calls f(ctx, q).
+func (f TLSFingerprintProfileFunc) Query(ctx context.Context, q ent.Query) (ent.Value, error) {
+	if q, ok := q.(*ent.TLSFingerprintProfileQuery); ok {
+		return f(ctx, q)
+	}
+	return nil, fmt.Errorf("unexpected query type %T. expect *ent.TLSFingerprintProfileQuery", q)
+}
+
+// The TraverseTLSFingerprintProfile type is an adapter to allow the use of ordinary function as Traverser.
+type TraverseTLSFingerprintProfile func(context.Context, *ent.TLSFingerprintProfileQuery) error
+
+// Intercept is a dummy implementation of Intercept that returns the next Querier in the pipeline.
+func (f TraverseTLSFingerprintProfile) Intercept(next ent.Querier) ent.Querier {
+	return next
+}
+
+// Traverse calls f(ctx, q).
+func (f TraverseTLSFingerprintProfile) Traverse(ctx context.Context, q ent.Query) error {
+	if q, ok := q.(*ent.TLSFingerprintProfileQuery); ok {
+		return f(ctx, q)
+	}
+	return fmt.Errorf("unexpected query type %T. expect *ent.TLSFingerprintProfileQuery", q)
+}
+
 // The UsageCleanupTaskFunc type is an adapter to allow the use of ordinary function as a Querier.
 type UsageCleanupTaskFunc func(context.Context, *ent.UsageCleanupTaskQuery) (ent.Value, error)
 
@@ -686,6 +714,8 @@ func NewQuery(q ent.Query) (Query, error) {
 		return &query[*ent.SecuritySecretQuery, predicate.SecuritySecret, securitysecret.OrderOption]{typ: ent.TypeSecuritySecret, tq: q}, nil
 	case *ent.SettingQuery:
 		return &query[*ent.SettingQuery, predicate.Setting, setting.OrderOption]{typ: ent.TypeSetting, tq: q}, nil
+	case *ent.TLSFingerprintProfileQuery:
+		return &query[*ent.TLSFingerprintProfileQuery, predicate.TLSFingerprintProfile, tlsfingerprintprofile.OrderOption]{typ: ent.TypeTLSFingerprintProfile, tq: q}, nil
 	case *ent.UsageCleanupTaskQuery:
 		return &query[*ent.UsageCleanupTaskQuery, predicate.UsageCleanupTask, usagecleanuptask.OrderOption]{typ: ent.TypeUsageCleanupTask, tq: q}, nil
 	case *ent.UsageLogQuery: