feat: add Grimmory/Booklore push integration

- Added "Push to Library" button to issues archive
- Implemented direct API upload to Grimmory/Booklore
- Added support for `.env` files via `python-dotenv`
- Handled 409 Conflict for duplicate files gracefully
- Resolved library name to numeric ID for direct uploads
- Fixed SQLAlchemy and ebooklib warnings in tests
- Added comprehensive tests for push functionality

Made-with: Cursor

README.md

@@ -37,6 +37,19 @@ Settings are editable via the web UI at `/settings`, or in `config.py`:
 - `FETCH_INTERVAL_HOURS` — how often to check for new articles
 - `IMAGE_MAX_LANDSCAPE` / `IMAGE_MAX_PORTRAIT` — image bounding box dimensions
 
+### Integration with Grimmory / Booklore
+
+You can automatically push generated issues to a [Grimmory](https://github.com/grimmory-tools/grimmory) or Booklore instance. Create a `.env` file in the root directory (or set these as system environment variables):
+
+```env
+GRIMMORY_URL=http://your-grimmory-instance:6060
+GRIMMORY_USERNAME=your_username
+GRIMMORY_PASSWORD=your_password
+GRIMMORY_LIBRARY_ID=optional_library_id
+```
+
+*Note: `BOOKLORE_URL`, `BOOKLORE_USERNAME`, `BOOKLORE_PASSWORD`, and `BOOKLORE_LIBRARY_ID` are also supported as deprecated fallbacks for older Booklore instances.*
+
 ## Access from Other Devices
 
 The app binds to `0.0.0.0:5000`, so access it from any device on your network using your Mac's IP address (e.g., `http://192.168.1.x:5000`).