feat: 初始化 Nest 服务骨架与多平台 Chat SSE 网关

- 新增 NestJS + Fastify 入口、配置模块与 Swagger 集成
- 划分 client-app / admin-app 与 shared-domain ai-gateway
- 实现统一 SSE Chat 接口，支持千问、DeepSeek、火山引擎非流式上游与网关分片输出
- 补充项目方案与 JWT 最小实现文档

Made-with: Cursor

package.json

@@ -0,0 +1,52 @@
+{
+  "name": "chat-one-service",
+  "version": "1.0.0",
+  "description": "ChatOne service",
+  "main": "dist/main.js",
+  "repository": "ssh://git@git.alboped.com:8022/alboped/chat-one-service.git",
+  "author": "alboped <shi_zhaojun@aliyun.com>",
+  "license": "MIT",
+  "private": true,
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "start": "node dist/main.js",
+    "start:dev": "tsx watch src/main.ts",
+    "start:debug": "node --inspect=0.0.0.0:9229 dist/main.js",
+    "lint": "eslint \"src/**/*.ts\""
+  },
+  "dependencies": {
+    "@fastify/static": "^9.1.1",
+    "@nestjs/common": "^11.1.19",
+    "@nestjs/config": "^4.0.4",
+    "@nestjs/core": "^11.1.19",
+    "@nestjs/jwt": "^11.0.2",
+    "@nestjs/passport": "^11.0.5",
+    "@nestjs/platform-fastify": "^11.1.19",
+    "@nestjs/schedule": "^6.1.3",
+    "@nestjs/swagger": "^11.3.0",
+    "@nestjs/throttler": "^6.5.0",
+    "@prisma/client": "^7.7.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.15.1",
+    "dayjs": "^1.11.20",
+    "helmet": "^8.1.0",
+    "ioredis": "^5.10.1",
+    "nestjs-pino": "^4.6.1",
+    "passport": "^0.7.0",
+    "passport-jwt": "^4.0.1",
+    "pino-http": "^11.0.0",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.2",
+    "undici": "^8.1.0"
+  },
+  "devDependencies": {
+    "@types/node": "^25.6.0",
+    "eslint": "^10.2.0",
+    "pino-pretty": "^13.1.3",
+    "prettier": "^3.8.3",
+    "prisma": "^7.7.0",
+    "ts-node": "^10.9.2",
+    "tsx": "^4.21.0",
+    "typescript": "^6.0.2"
+  }
+}