feat: PWA支持（manifest+Service Worker缓存+图标，可添加到主屏幕/离线/增量更新）

app/main.py

@@ -11,7 +11,7 @@ from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import HTMLResponse
+from fastapi.responses import FileResponse, HTMLResponse
 from fastapi.staticfiles import StaticFiles
 from jinja2 import Environment, FileSystemLoader
 from sqlmodel import Session
@@ -64,6 +64,16 @@ def index() -> HTMLResponse:
     return HTMLResponse(html)
 
 
+@app.get("/sw.js", include_in_schema=False)
+def service_worker() -> FileResponse:
+    """Service Worker（置于根路径以使 scope 覆盖全站）"""
+    return FileResponse(
+        STATIC_DIR / "sw.js",
+        media_type="application/javascript",
+        headers={"Service-Worker-Allowed": "/"},
+    )
+
+
 @app.get("/health")
 def health_check() -> dict:
     """健康检查（version 动态读取，便于验证自动更新）"""

app/templates/index.html

@@ -4,6 +4,12 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
   <title>{{ app_name }}</title>
+  <link rel="manifest" href="/static/manifest.json">
+  <meta name="theme-color" content="#2563eb">
+  <link rel="apple-touch-icon" href="/static/icons/icon-192.png">
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+  <meta name="apple-mobile-web-app-title" content="资产管理">
   <script src="/static/js/tailwind.js"></script>
   <script>tailwind.config = { darkMode: 'class' };</script>
   <script src="/static/js/vue.global.prod.js"></script>
@@ -19,5 +25,12 @@
   <div id="app"></div>
   <script src="/static/js/api.js"></script>
   <script src="/static/js/app.js"></script>
+  <script>
+    if ('serviceWorker' in navigator) {
+      window.addEventListener('load', function () {
+        navigator.serviceWorker.register('/sw.js').catch(function () {});
+      });
+    }
+  </script>
 </body>
 </html>