feat: 添加客户端更新检测功能，支持版本检查和更新提示；更新相关组件和样式

backend/app/main.py

@@ -6,6 +6,7 @@
 
 import asyncio
 import logging
+import re
 import threading
 import time
 from contextlib import asynccontextmanager
@@ -15,6 +16,7 @@ from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
+from pydantic import BaseModel
 
 from .admin import admin_login, admin_logout, admin_page
 from .config import settings
@@ -120,6 +122,52 @@ async def download_installer():
     return JSONResponse({"detail": "安装包不存在"}, status_code=404)
 
 
+# ---------- 客户端更新检测（仅 Windows：比对版本 → 下发安装包下载地址） ----------
+
+def _latest_installer():
+    """返回 backend/ 下最新（按文件名排序取最大）的 *.setup.exe。"""
+    for f in sorted(_DOWNLOAD_ROOT.glob("*setup.exe"), reverse=True):
+        if f.is_file():
+            return f
+    return None
+
+
+def _version_from_name(name: str) -> str:
+    """从安装包文件名解析版本，如 `..._0.1.0_x64-setup.exe` → `0.1.0`。"""
+    m = re.search(r"_(\d+\.\d+(?:\.\d+)?)", name or "")
+    return m.group(1) if m else ""
+
+
+def _version_key(v: str):
+    return tuple(int(x) for x in v.split(".") if x.isdigit())
+
+
+class UpdateCheckBody(BaseModel):
+    current: str = ""   # 前端上报的当前版本，如 0.1.0
+
+
+@app.post("/api/update/check", include_in_schema=False)
+async def update_check(body: UpdateCheckBody):
+    """检测更新：返回最新版本号、安装包下载地址、是否需要更新（仅 Windows）。"""
+    inst = _latest_installer()
+    if not inst:
+        return {"ok": False, "error": "installer not found"}
+    latest = _version_from_name(inst.name)
+    current = (body.current or "").strip()
+    update_available = False
+    if latest and current and current != latest:
+        update_available = _version_key(latest) > _version_key(current)
+    elif latest and not current:
+        update_available = True
+    return {
+        "ok": True,
+        "latest_version": latest,
+        "installer_name": inst.name,
+        "download_url": "/download",
+        "update_available": update_available,
+    }
+
+
 # ---------- 前端静态托管 + SPA 回退（浏览器直接访问 :8000 即可） ----------
 
 @app.get("/{path:path}", include_in_schema=False)