feat: initial commit - oncology literature search platform

OncoLit: a multi-tenant oncology literature search, feed, and
collaboration platform. Built with FastAPI + Vue 3 + PostgreSQL.
Includes PubMed pipeline, drug approvals, AI summaries, and
systematic review tools.

frontend/public/manifest.json

@@ -0,0 +1,17 @@
+{
+  "name": "SciLit Oncology - 肿瘤科文献中心",
+  "short_name": "SciLit Oncology",
+  "description": "全球肿瘤学进展，每日自动推送。覆盖 NEJM/Lancet/JAMA/JCO 等顶级期刊。",
+  "start_url": "/app/feed",
+  "display": "standalone",
+  "background_color": "#f5f7fa",
+  "theme_color": "#1a5276",
+  "orientation": "any",
+  "icons": [
+    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png" }
+  ],
+  "categories": ["medical", "education", "productivity"],
+  "lang": "zh-CN",
+  "scope": "/"
+}

frontend/public/robots.txt

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+User-agent: *
+Allow: /
+Allow: /literature/
+Allow: /journals/
+Allow: /drugs/
+Allow: /guidelines/
+Allow: /help/
+Disallow: /app/
+Disallow: /admin/
+Disallow: /auth/
+Disallow: /api/
+Sitemap: https://scilit-oncology.com/sitemap.xml

frontend/public/sw.js

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+// Service Worker — 离线缓存 + 推送通知
+const CACHE_NAME = 'scilit-oncology-v1';
+const STATIC_ASSETS = ['/', '/app/feed', '/app/search', '/app/library'];
+
+self.addEventListener('install', (event) => {
+  (event as any).waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(STATIC_ASSETS))
+  );
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+  (event as any).waitUntil(
+    caches.keys().then((keys) =>
+      Promise.all(keys.filter((k) => k !== CACHE_NAME).map((k) => caches.delete(k)))
+    )
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (event) => {
+  const req = (event as FetchEvent).request;
+  // API 请求不缓存
+  if (req.url.includes('/api/')) return;
+  (event as any).respondWith(
+    caches.match(req).then((cached) => cached || fetch(req))
+  );
+});