feat: SafeLine CE 9.3.9 with pro features

- Remove telemetry: disabled all phone-home (installation notify, false positives, behavior tracking, upgrade tips)
- Version branding: removed 'ce-' prefix, product name changed to '长亭雷池 WAF'
- Detection engine enhancement: strict preset enables all 17 modules with aggressive configs
- Multi-user RBAC: admin/operator/viewer roles with password + TOTP 2FA
- Rate limiting: nginx limit_req per website (RPS, burst, action)
- JS Challenge: browser fingerprint verification page with cookie-based bypass
- Security fixes: removed InsecureSkipVerify, hardcoded credentials, NO_AUTH backdoor

management/webserver/api/response/error.go

@@ -0,0 +1,11 @@
+package response
+
+const (
+	ErrLoginRequired = "login-required"
+	ErrWrongPasscode = "wrong-passcode"
+	ErrWrongTimeGap  = "wrong-time-gap"
+	ErrInternalError = "internal-error"
+	ErrDataNotExist  = "data-not-exist"
+	ErrWrongFileType = "wrong-filetype"
+	ErrReadOnly      = "read-only"
+)