feat: modernize UI with Astro+Svelte and optimize Docker build

- Migrated frontend to Astro + Svelte 5 for cyberpunk aesthetic
- Switched to Bun for faster frontend builds
- Implemented multi-stage Docker build for smaller image size
- Refactored backend to serve static assets and proxy API requests
- Added recovery mode for manual file management

browser-extension/browser-extension-0.4.2/extension/manifest-firefox.json

@@ -0,0 +1,27 @@
+{
+    "manifest_version": 2,
+    "name": "TubeArchivist Companion",
+    "description": "Interact with your selfhosted TA server.",
+    "version": "0.4.2",
+    "icons": {
+        "128": "/images/icon128.png"
+    },
+    "browser_action": {
+        "default_icon": "/images/icon.png",
+        "default_popup": "index.html"
+    },
+    "permissions": [
+        "storage",
+        "cookies",
+        "https://*.youtube.com/*"
+    ],
+    "content_scripts": [
+        {
+            "matches": ["https://www.youtube.com/*"],
+            "js": ["script.js"]
+        }
+    ],
+    "background": {
+        "scripts": ["background.js"]
+    }
+}