feat(security): harden gateway boundaries and usage policies

Consolidate subscription usage policy enforcement, privacy-safe persistence, and gateway security hardening into one reviewable change.

Includes bounded HTTP and execution envelopes, header and protocol guards, DNS and relay validation, authentication and secret projection hardening, secure backup/install paths, and regression coverage.

frontend/src/api/auth.ts

@@ -40,11 +40,13 @@ export interface SendVerificationCodeResponse {
   message: string
   success: boolean
   expire_minutes?: number
+  verification_token: string
 }
 
 export interface VerifyEmailRequest {
   email: string
   code: string
+  verification_token: string
 }
 
 export interface VerifyEmailResponse {
@@ -54,6 +56,7 @@ export interface VerifyEmailResponse {
 
 export interface VerificationStatusRequest {
   email: string
+  verification_token: string
 }
 
 export interface VerificationStatusResponse {
@@ -72,6 +75,7 @@ export interface RegisterRequest {
   invite_code?: string
   privacy_policy_accepted?: boolean
   privacy_policy_version?: string
+  email_verification_token?: string
 }
 
 export interface RegisterResponse {
@@ -141,7 +145,7 @@ export interface User {
 export const authApi = {
   async login(credentials: LoginRequest): Promise<LoginResponse> {
     const response = await apiClient.post<LoginResponse>('/api/auth/login', credentials)
-    apiClient.setToken(response.data.access_token)
+    apiClient.setToken(response.data.access_token, true)
     return response.data
   },
 
@@ -184,10 +188,14 @@ export const authApi = {
     return response.data
   },
 
-  async verifyEmail(email: string, code: string): Promise<VerifyEmailResponse> {
+  async verifyEmail(
+    email: string,
+    code: string,
+    verificationToken: string
+  ): Promise<VerifyEmailResponse> {
     const response = await apiClient.post<VerifyEmailResponse>(
       '/api/auth/verify-email',
-      { email, code }
+      { email, code, verification_token: verificationToken }
     )
     return response.data
   },
@@ -204,10 +212,13 @@ export const authApi = {
     return response.data
   },
 
-  async getVerificationStatus(email: string): Promise<VerificationStatusResponse> {
+  async getVerificationStatus(
+    email: string,
+    verificationToken: string
+  ): Promise<VerificationStatusResponse> {
     const response = await apiClient.post<VerificationStatusResponse>(
       '/api/auth/verification-status',
-      { email }
+      { email, verification_token: verificationToken }
     )
     return response.data
   },