feat(groups): add Claude Code client restriction and session isolation

- Add claude_code_only field to restrict groups to Claude Code clients only
- Add fallback_group_id for non-Claude Code requests to use alternate group
- Implement ClaudeCodeValidator for User-Agent detection
- Add group-level session binding isolation (groupID in Redis key)
- Prevent cross-group sticky session pollution
- Update frontend with Claude Code restriction controls

frontend/src/types/index.ts

@@ -263,6 +263,9 @@ export interface Group {
   image_price_1k: number | null
   image_price_2k: number | null
   image_price_4k: number | null
+  // Claude Code 客户端限制
+  claude_code_only: boolean
+  fallback_group_id: number | null
   account_count?: number
   created_at: string
   updated_at: string
@@ -298,6 +301,15 @@ export interface CreateGroupRequest {
   platform?: GroupPlatform
   rate_multiplier?: number
   is_exclusive?: boolean
+  subscription_type?: SubscriptionType
+  daily_limit_usd?: number | null
+  weekly_limit_usd?: number | null
+  monthly_limit_usd?: number | null
+  image_price_1k?: number | null
+  image_price_2k?: number | null
+  image_price_4k?: number | null
+  claude_code_only?: boolean
+  fallback_group_id?: number | null
 }
 
 export interface UpdateGroupRequest {
@@ -307,6 +319,15 @@ export interface UpdateGroupRequest {
   rate_multiplier?: number
   is_exclusive?: boolean
   status?: 'active' | 'inactive'
+  subscription_type?: SubscriptionType
+  daily_limit_usd?: number | null
+  weekly_limit_usd?: number | null
+  monthly_limit_usd?: number | null
+  image_price_1k?: number | null
+  image_price_2k?: number | null
+  image_price_4k?: number | null
+  claude_code_only?: boolean
+  fallback_group_id?: number | null
 }
 
 // ==================== Account & Proxy Types ====================