Add single domain gateway routing

ai_knowledge_base_v2/apps/user-client/.env.example

@@ -1 +1 @@
-VITE_API_BASE_URL=http://127.0.0.1:8100/api
+VITE_API_BASE_URL=/api

ai_knowledge_base_v2/apps/user-client/README.md

@@ -33,7 +33,11 @@ npm run dev
 
 默认 API 地址为：
 
-`http://127.0.0.1:8100/api`
+`/api`
+
+统一入口访问地址为：
+
+`http://127.0.0.1:8080/`
 
 ## 说明
 

ai_knowledge_base_v2/apps/user-client/src/services/api.ts

@@ -1,6 +1,6 @@
 import type { ApiResponse, CaptchaResult, ChatMessage, ChatSession, LoginResult, UserProfile } from "../types/api";
 
-const API_BASE = import.meta.env.VITE_API_BASE_URL ?? "http://127.0.0.1:8100/api";
+const API_BASE = import.meta.env.VITE_API_BASE_URL ?? "/api";
 const TOKEN_KEY = "ai-kb-user-token";
 
 export function getToken() {