fix(cliproxy): resolve regex escape bug and complete DRY refactor

- Fix regex escape in auth-utils.ts: `\\.` not `\\\\.` (dot matcher)
- Refactor quota-fetcher.ts to import from auth-utils.ts (DRY)
- Remove unused UnifiedQuotaResult type (YAGNI)
- Add maintenance comment to Gemini model groups

Addresses code review feedback on PR #395

src/cliproxy/auth-utils.ts

@@ -9,7 +9,7 @@
  * Replaces @ and . with underscores for filesystem compatibility.
  */
 export function sanitizeEmail(email: string): string {
-  return email.replace(/@/g, '_').replace(/\\./g, '_');
+  return email.replace(/@/g, '_').replace(/\./g, '_');
 }
 
 /**

src/cliproxy/quota-fetcher-gemini-cli.ts

@@ -16,7 +16,10 @@ import type { GeminiCliQuotaResult, GeminiCliBucket } from './quota-types';
 const GEMINI_CLI_API_BASE = 'https://cloudcode-pa.googleapis.com';
 const GEMINI_CLI_API_VERSION = 'v1internal';
 
-/** Model groups for quota consolidation */
+/**
+ * Model groups for quota consolidation.
+ * Update when Google releases new Gemini models to include them in quota display.
+ */
 const GEMINI_CLI_GROUPS: Record<
   string,
   {

src/cliproxy/quota-fetcher.ts

@@ -16,6 +16,7 @@ import {
   type AccountInfo,
   type AccountTier,
 } from './account-manager';
+import { sanitizeEmail, isTokenExpired } from './auth-utils';
 
 /** Individual model quota info */
 export interface ModelQuota {
@@ -154,27 +155,6 @@ interface FetchAvailableModelsResponse {
   models?: Record<string, AvailableModel>;
 }
 
-/**
- * Sanitize email to match CLIProxyAPI auth file naming convention
- * Replaces @ and . with underscores (matches Go sanitizeAntigravityFileName)
- */
-function sanitizeEmail(email: string): string {
-  return email.replace(/@/g, '_').replace(/\./g, '_');
-}
-
-/**
- * Check if token is expired based on the expired timestamp
- */
-function isTokenExpired(expiredStr?: string): boolean {
-  if (!expiredStr) return false;
-  try {
-    const expiredDate = new Date(expiredStr);
-    return expiredDate.getTime() < Date.now();
-  } catch {
-    return false;
-  }
-}
-
 /**
  * Refresh access token using refresh_token via Google OAuth
  * This allows CCS to get fresh tokens independently of CLIProxyAPI

src/cliproxy/quota-types.ts

@@ -5,8 +5,6 @@
  * Supports Antigravity, Codex, and Gemini CLI providers.
  */
 
-import type { QuotaResult as AntigravityQuotaResult } from './quota-fetcher';
-
 /** Supported quota providers */
 export type QuotaProvider = 'agy' | 'codex' | 'gemini';
 
@@ -84,26 +82,3 @@ export interface GeminiCliQuotaResult {
   /** Account ID (email) this quota belongs to */
   accountId?: string;
 }
-
-/**
- * Unified quota result wrapper for CLI/Dashboard
- * Contains provider-specific data in nested fields
- */
-export interface UnifiedQuotaResult {
-  /** Provider this result belongs to */
-  provider: QuotaProvider;
-  /** Whether fetch succeeded */
-  success: boolean;
-  /** Timestamp of fetch */
-  lastUpdated: number;
-  /** Error message if fetch failed */
-  error?: string;
-  /** Account ID (email) this quota belongs to */
-  accountId?: string;
-  /** Antigravity-specific quota data */
-  antigravity?: AntigravityQuotaResult;
-  /** Codex-specific quota data */
-  codex?: CodexQuotaResult;
-  /** Gemini CLI-specific quota data */
-  geminiCli?: GeminiCliQuotaResult;
-}