Merge pull request #959 from touwaeriol/feat/antigravity-403-detection

feat(antigravity): add 403 forbidden status detection and display

frontend/src/types/index.ts

@@ -769,6 +769,21 @@ export interface AccountUsageInfo {
   gemini_pro_minute?: UsageProgress | null
   gemini_flash_minute?: UsageProgress | null
   antigravity_quota?: Record<string, AntigravityModelQuota> | null
+  // Antigravity 403 forbidden 状态
+  is_forbidden?: boolean
+  forbidden_reason?: string
+  forbidden_type?: string   // "validation" | "violation" | "forbidden"
+  validation_url?: string   // 验证/申诉链接
+
+  // 状态标记（后端自动推导）
+  needs_verify?: boolean    // 需要人工验证（forbidden_type=validation）
+  is_banned?: boolean       // 账号被封（forbidden_type=violation）
+  needs_reauth?: boolean    // token 失效需重新授权（401）
+
+  // 机器可读错误码：forbidden / unauthenticated / rate_limited / network_error
+  error_code?: string
+
+  error?: string            // usage 获取失败时的错误信息
 }
 
 // OpenAI Codex usage snapshot (from response headers)