Add minimal installable PWA support

- serve manifest and service worker from the app root for install compatibility
- add manifest metadata, service worker registration, and Apple touch icon links to the base template
- add install icon assets for Android, iOS, and desktop install flows
- document deployment and validation notes for the new PWA support
- cover the new endpoints and template output with tests

README.md

@@ -18,10 +18,29 @@
 - Box / Item / SubItem 基础 CRUD
 - Box / Item / SubItem 单图上传、替换、删除、展示
 - Box / Item / SubItem 全局搜索
+- 最小 PWA 安装支持（主屏幕 / 桌面安装）
 - Docker / Compose 长期运行
 - SQLite 数据持久化
 - 基础自动化测试
 
+## PWA 安装支持
+
+当前版本在不改变 FastAPI + Jinja2 SSR 结构的前提下，补充了最小可维护的 PWA 能力：
+
+- 提供根路径 `manifest.webmanifest`
+- 提供根路径 `service-worker.js`
+- 在基础模板中注入 `manifest`、`theme-color`、`apple-touch-icon` 和安装相关 meta
+- 支持 Android Chrome 添加到主屏幕
+- 支持 iPhone Safari 添加到主屏幕
+- 支持桌面 Chrome / Edge 安装为独立 app 窗口
+
+当前新增的安装图标尺寸：
+
+- `180x180`：Apple touch icon
+- `192x192`：Android / Chromium 安装图标
+- `512x512`：高分辨率安装图标
+- `512x512`：maskable 图标
+
 ## 当前数据模型
 
 这个项目不是无限树结构，而是固定最多 3 级：
@@ -110,6 +129,9 @@ Box
 
 这一阶段仍然没有实现以下内容：
 
+- 离线访问
+- 离线缓存策略
+- 离线数据同步
 - 多图上传
 - OCR
 - AI 识别物品
@@ -223,6 +245,22 @@ uvicorn app.main:app --reload --host 0.0.0.0 --port 10000
 http://localhost:10000
 ```
 
+本地开发验证 PWA 时，页面与安装元数据可以直接检查；如果要完整验证桌面安装体验，优先在 HTTPS 或受信任反向代理环境下测试。
+
+## PWA 部署注意事项
+
+- 生产环境应使用 HTTPS；Android Chrome 和桌面 Chrome / Edge 的安装能力通常要求安全上下文
+- `manifest.webmanifest` 需要返回 `application/manifest+json`
+- `service-worker.js` 需要从站点根路径返回，保证作用域覆盖整个应用
+- 如果前面有 nginx 或其他反向代理，不要拦截或改写这两个根路径资源
+- iPhone Safari 的“添加到主屏幕”主要依赖 meta 和 `apple-touch-icon`，不包含离线能力
+
+## PWA 简单验收
+
+1. Android Chrome：打开站点，确认浏览器菜单或地址栏出现“添加到主屏幕”或“安装应用”。
+2. iPhone Safari：打开站点，点击分享菜单，确认可见“添加到主屏幕”。
+3. Desktop Chrome / Edge：打开站点，确认地址栏或菜单中出现“安装应用”。
+
 本地默认数据库位置：
 
 ```text

app/main.py

@@ -1,7 +1,8 @@
 from contextlib import asynccontextmanager
+from pathlib import Path
 
 from fastapi import Depends, FastAPI, File, Form, HTTPException, Request, UploadFile, status
-from fastapi.responses import RedirectResponse, Response
+from fastapi.responses import FileResponse, RedirectResponse, Response
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 from sqlalchemy import func, or_
@@ -12,6 +13,7 @@ from app.images import process_upload
 from app.models import Box, Item, SubItem
 
 templates = Jinja2Templates(directory="app/templates")
+STATIC_DIR = Path("app/static")
 
 
 def _clean_text(value: str | None) -> str | None:
@@ -193,6 +195,20 @@ def create_app() -> FastAPI:
     def root() -> RedirectResponse:
         return RedirectResponse(url="/boxes", status_code=status.HTTP_302_FOUND)
 
+    @app.get("/manifest.webmanifest", include_in_schema=False)
+    def manifest() -> FileResponse:
+        return FileResponse(
+            path=STATIC_DIR / "manifest.webmanifest",
+            media_type="application/manifest+json",
+        )
+
+    @app.get("/service-worker.js", include_in_schema=False)
+    def service_worker() -> FileResponse:
+        return FileResponse(
+            path=STATIC_DIR / "service-worker.js",
+            media_type="application/javascript",
+        )
+
     @app.get("/search")
     def search_page(
         request: Request,

app/static/manifest.webmanifest

@@ -0,0 +1,31 @@
+{
+  "name": "搬家助手",
+  "short_name": "搬家助手",
+  "description": "用于记录搬家装箱内容并快速搜索的轻量工具。",
+  "start_url": "/boxes",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "portrait-primary",
+  "background_color": "#f4f4f4",
+  "theme_color": "#0b57d0",
+  "icons": [
+    {
+      "src": "/static/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/static/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/static/icons/icon-512-maskable.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
+}

app/static/service-worker.js

@@ -0,0 +1,7 @@
+self.addEventListener("install", function () {
+    self.skipWaiting();
+});
+
+self.addEventListener("activate", function (event) {
+    event.waitUntil(self.clients.claim());
+});

app/templates/base.html

@@ -3,7 +3,15 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="theme-color" content="#0b57d0">
+    <meta name="mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-title" content="搬家助手">
+    <meta name="apple-mobile-web-app-status-bar-style" content="default">
     <title>{{ page_title or "搬家助手" }}</title>
+    <link rel="manifest" href="/manifest.webmanifest">
+    <link rel="icon" href="/static/icons/icon-192.png" sizes="192x192" type="image/png">
+    <link rel="apple-touch-icon" href="/static/icons/apple-touch-icon.png" sizes="180x180">
     <link rel="stylesheet" href="/static/style.css">
 </head>
 <body>
@@ -15,6 +23,12 @@
         {% block content %}{% endblock %}
     </main>
     <script>
+        if ("serviceWorker" in navigator) {
+            window.addEventListener("load", function () {
+                navigator.serviceWorker.register("/service-worker.js");
+            });
+        }
+
         document.addEventListener("click", function (event) {
             const card = event.target.closest(".clickable-card[data-href]");
             if (!card) return;

tests/test_app.py

@@ -111,6 +111,39 @@ def test_boxes_page_uses_relative_stylesheet_path(client):
     assert "http://" not in response.text.split("/static/style.css")[0]
 
 
+def test_base_template_includes_pwa_metadata(client):
+    response = client.get("/boxes")
+
+    assert response.status_code == 200
+    assert 'rel="manifest" href="/manifest.webmanifest"' in response.text
+    assert 'name="theme-color" content="#0b57d0"' in response.text
+    assert 'rel="apple-touch-icon" href="/static/icons/apple-touch-icon.png"' in response.text
+    assert 'navigator.serviceWorker.register("/service-worker.js")' in response.text
+
+
+def test_manifest_is_served_with_pwa_fields(client):
+    response = client.get("/manifest.webmanifest")
+
+    assert response.status_code == 200
+    assert response.headers["content-type"].startswith("application/manifest+json")
+
+    manifest = response.json()
+    assert manifest["name"] == "搬家助手"
+    assert manifest["short_name"] == "搬家助手"
+    assert manifest["start_url"] == "/boxes"
+    assert manifest["display"] == "standalone"
+    assert any(icon["sizes"] == "192x192" for icon in manifest["icons"])
+    assert any(icon["purpose"] == "maskable" for icon in manifest["icons"])
+
+
+def test_service_worker_is_served_from_root(client):
+    response = client.get("/service-worker.js")
+
+    assert response.status_code == 200
+    assert response.headers["content-type"].startswith("application/javascript")
+    assert 'self.addEventListener("install"' in response.text
+
+
 def test_boxes_overview_card_shows_note_and_item_count_without_room_or_status(client, db_session):
     box = Box(
         name="Kitchen Box",