Update development scripts and add macOS icon assets

- Renamed backend development script from `dev:backend` to `dev:server` for clarity.
- Added new macOS icon assets and configuration files for the application.
- Enhanced App component to improve server management during production and development modes.
- Updated ConnectionForm to reset state after successful submission and conditionally render the update button.
- Implemented database initialization on application startup in the backend.

package.json

@@ -10,7 +10,7 @@
   "scripts": {
     "dev": "cd tauri && bun run tauri dev",
     "dev:web": "cd web && bun run dev",
-    "dev:backend": "source backend/venv/bin/activate && uvicorn backend.main:app --reload --port 8000",
+    "dev:server": "source backend/venv/bin/activate && uvicorn backend.main:app --reload --port 8000",
     "build": "cd tauri && bun run tauri build",
     "build:web": "cd web && bun run build",
     "generate:api": "./scripts/generate-api.sh",