v2.0: Major feature update

New Features:
- API key authentication for external access
- Apple Shortcuts integration endpoint (/api/v1/add)
- Full-text search across all articles
- Folders for organizing articles
- Highlights and notes on articles
- Reading stats with streaks
- Reading goals (daily/weekly/monthly)
- Import from Pocket/Instapaper
- RSS feed output
- PWA support for mobile
- Auto theme scheduling (day/night)
- Settings page with all configuration

API Endpoints:
- /api/v1/add - Add articles via API key
- /api/keys - Manage API keys
- /api/search - Full-text search
- /api/folders - Folder management
- /api/highlights - Highlights/notes
- /api/stats - Reading statistics
- /api/goals - Reading goals
- /api/import - Pocket/Instapaper import
- /api/rss - RSS feed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

public/icons/icon.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" fill="none">
+  <rect width="512" height="512" rx="96" fill="#000"/>
+  <path d="M128 144h256v32H128zM128 208h256v32H128zM128 272h192v32H128zM128 336h224v32H128z" fill="#fff"/>
+  <circle cx="384" cy="384" r="80" fill="#3b82f6"/>
+  <path d="M384 344v80M344 384h80" stroke="#fff" stroke-width="16" stroke-linecap="round"/>
+</svg>

public/manifest.json

@@ -0,0 +1,37 @@
+{
+  "name": "ReadLater",
+  "short_name": "ReadLater",
+  "description": "Save articles and read them later with text-to-speech",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#000000",
+  "theme_color": "#000000",
+  "orientation": "portrait-primary",
+  "icons": [
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "categories": ["productivity", "utilities"],
+  "shortcuts": [
+    {
+      "name": "Add Article",
+      "url": "/?action=add",
+      "description": "Add a new article"
+    },
+    {
+      "name": "Favorites",
+      "url": "/?filter=favorites",
+      "description": "View favorite articles"
+    }
+  ]
+}