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/runtime/runtime.go

@@ -20,6 +20,7 @@ import (
 	"github.com/Wei-Shaw/sub2api/ent/schema"
 	"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"
@@ -746,6 +747,43 @@ func init() {
 	setting.DefaultUpdatedAt = settingDescUpdatedAt.Default.(func() time.Time)
 	// setting.UpdateDefaultUpdatedAt holds the default value on update for the updated_at field.
 	setting.UpdateDefaultUpdatedAt = settingDescUpdatedAt.UpdateDefault.(func() time.Time)
+	tlsfingerprintprofileMixin := schema.TLSFingerprintProfile{}.Mixin()
+	tlsfingerprintprofileMixinFields0 := tlsfingerprintprofileMixin[0].Fields()
+	_ = tlsfingerprintprofileMixinFields0
+	tlsfingerprintprofileFields := schema.TLSFingerprintProfile{}.Fields()
+	_ = tlsfingerprintprofileFields
+	// tlsfingerprintprofileDescCreatedAt is the schema descriptor for created_at field.
+	tlsfingerprintprofileDescCreatedAt := tlsfingerprintprofileMixinFields0[0].Descriptor()
+	// tlsfingerprintprofile.DefaultCreatedAt holds the default value on creation for the created_at field.
+	tlsfingerprintprofile.DefaultCreatedAt = tlsfingerprintprofileDescCreatedAt.Default.(func() time.Time)
+	// tlsfingerprintprofileDescUpdatedAt is the schema descriptor for updated_at field.
+	tlsfingerprintprofileDescUpdatedAt := tlsfingerprintprofileMixinFields0[1].Descriptor()
+	// tlsfingerprintprofile.DefaultUpdatedAt holds the default value on creation for the updated_at field.
+	tlsfingerprintprofile.DefaultUpdatedAt = tlsfingerprintprofileDescUpdatedAt.Default.(func() time.Time)
+	// tlsfingerprintprofile.UpdateDefaultUpdatedAt holds the default value on update for the updated_at field.
+	tlsfingerprintprofile.UpdateDefaultUpdatedAt = tlsfingerprintprofileDescUpdatedAt.UpdateDefault.(func() time.Time)
+	// tlsfingerprintprofileDescName is the schema descriptor for name field.
+	tlsfingerprintprofileDescName := tlsfingerprintprofileFields[0].Descriptor()
+	// tlsfingerprintprofile.NameValidator is a validator for the "name" field. It is called by the builders before save.
+	tlsfingerprintprofile.NameValidator = func() func(string) error {
+		validators := tlsfingerprintprofileDescName.Validators
+		fns := [...]func(string) error{
+			validators[0].(func(string) error),
+			validators[1].(func(string) error),
+		}
+		return func(name string) error {
+			for _, fn := range fns {
+				if err := fn(name); err != nil {
+					return err
+				}
+			}
+			return nil
+		}
+	}()
+	// tlsfingerprintprofileDescEnableGrease is the schema descriptor for enable_grease field.
+	tlsfingerprintprofileDescEnableGrease := tlsfingerprintprofileFields[2].Descriptor()
+	// tlsfingerprintprofile.DefaultEnableGrease holds the default value on creation for the enable_grease field.
+	tlsfingerprintprofile.DefaultEnableGrease = tlsfingerprintprofileDescEnableGrease.Default.(bool)
 	usagecleanuptaskMixin := schema.UsageCleanupTask{}.Mixin()
 	usagecleanuptaskMixinFields0 := usagecleanuptaskMixin[0].Fields()
 	_ = usagecleanuptaskMixinFields0