feat: 宇之然平台 v2.0 - 完整重构版

核心功能:
- 新增 JWT 认证系统，支持管理员登录/登出
- 前后端合并为单一 FastAPI 应用 (端口 8001)
- 系统概览页：6 个统计卡片，点击跳转筛选
- 选题管理页：批量操作 (刷新/创作/优化)，时间列展示
- 系统日志页：整合日志查看功能
- 用户管理页：管理员可创建/删除用户
- 移动端适配：响应式布局，底部导航栏
- 标题居中显示

技术改进:
- 添加 generated_at 字段支持创作时间记录
- 状态更新时自动同步 updated_at
- 所有 API 路由添加 JWT 认证保护
- 前端 authFetch 封装自动附加 Token
- 升级 FastAPI 0.136, Pydantic 2.13 等依赖

修复:
- 修复 API 500 错误 (数据库列缺失)
- 修复 formatRelativeTime 未定义错误
- 修复登录 Token 存储和自动附加逻辑

platform/backend/app/main.py

@@ -1,23 +1,24 @@
 import logging
-from fastapi import FastAPI, Depends, HTTPException
+from fastapi import FastAPI, Depends, HTTPException, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
 from sqlalchemy.orm import Session
 from datetime import datetime
 from pathlib import Path
-import os
+
 from .database import engine, get_db, init_db
 from .models import Base
-from .api import topics, system, articles, publisher
-from .initial_data import import_topics_from_json
+from .api import topics, system, articles, publishing, auth, admin, audit
+from .initial_data import import_initial_data
 
 app = FastAPI(title="宇之然内容创作平台", version="0.1.0")
 logger = logging.getLogger(__name__)
 
-# CORS - 生产环境应限制 origins
+# CORS
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],  # TODO: 生产环境改为具体域名
+    allow_origins=["*"],
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
@@ -26,40 +27,45 @@ app.add_middleware(
 # 初始化数据库
 Base.metadata.create_all(bind=engine)
 init_db()
-import_topics_from_json()  # 首次自动导入
+import_initial_data()
 
-# 注册路由
+# 注册 API 路由
 app.include_router(topics.router)
 app.include_router(system.router)
 app.include_router(articles.router)
-app.include_router(publisher.router)
+app.include_router(publishing.router)
+app.include_router(auth.router)
+app.include_router(admin.router)
+app.include_router(audit.router)
 
-# 挂载前端静态文件
+# 挂载前端
 FRONTEND_DIR = Path(__file__).parent.parent.parent / "frontend"
-STATIC_DIR = FRONTEND_DIR / "static"
-
-# 检查前端文件是否存在，若不存在下载Element Plus等依赖
-if not FRONTEND_DIR.exists():
-    FRONTEND_DIR.mkdir(parents=True, exist_ok=True)
-    logger = logging.getLogger(__name__)
-    logger.warning(f"Frontend dir not found: {FRONTEND_DIR}, will serve API only")
-
-# 默认静态文件服务（若前端存在）
 if FRONTEND_DIR.exists() and (FRONTEND_DIR / "index.html").exists():
     app.mount("/", StaticFiles(directory=str(FRONTEND_DIR), html=True), name="frontend")
-    if STATIC_DIR.exists():
-        app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")
-    logging.getLogger(__name__).info(f"Frontend mounted at / from {FRONTEND_DIR}")
+    logger.info(f"Frontend mounted at / from {FRONTEND_DIR}")
+
+    # SW 特殊处理
+    sw_path = FRONTEND_DIR / "sw.js"
+    if sw_path.exists():
+        @app.get("/sw.js")
+        async def service_worker():
+            return FileResponse(
+                sw_path,
+                media_type="application/javascript",
+                headers={"Cache-Control": "no-cache", "Service-Worker-Allowed": "/"}
+            )
+
+    # 离线页面
+    offline_path = FRONTEND_DIR / "offline.html"
+    if offline_path.exists():
+        @app.get("/offline.html")
+        async def offline_page():
+            return FileResponse(offline_path, media_type="text/html")
 else:
     @app.get("/")
     def root():
-        return {
-            "service": "宇之然内容创作平台 API",
-            "version": "0.1.0",
-            "docs": "/docs",
-            "frontend_missing": str(FRONTEND_DIR)
-        }
+        return {"service": "API only", "docs": "/docs"}
 
 if __name__ == "__main__":
     import uvicorn
-    uvicorn.run("app.main:app", host="0.0.0.0", port=8000, reload=True)
+    uvicorn.run("app.main:app", host="0.0.0.0", port=8001)