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

tests/test_epub_builder.py

@@ -87,7 +87,10 @@ def test_build_epub_respects_article_order(app, db, tmp_path):
         )
 
         from ebooklib import epub as epublib
-        book = epublib.read_epub(epub_path)
+        import warnings
+        with warnings.catch_warnings():
+            warnings.filterwarnings("ignore", category=FutureWarning, module="ebooklib")
+            book = epublib.read_epub(epub_path, options={'ignore_ncx': True})
         spine_items = [book.get_item_with_id(item_id)
                        for item_id, _ in book.spine if item_id != "nav"]
         titles = []