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

config.py

@@ -1,4 +1,7 @@
 import os
+from dotenv import load_dotenv
+
+load_dotenv()
 
 BASE_DIR = os.path.abspath(os.path.dirname(__file__))
 DATA_DIR = os.path.join(BASE_DIR, "data")
@@ -14,3 +17,9 @@ FETCH_INTERVAL_HOURS = 1
 IMAGE_MAX_LANDSCAPE = (800, 480)
 IMAGE_MAX_PORTRAIT = (480, 800)
 COVER_SIZE = (480, 800)
+
+# Grimmory config (preferred) with Booklore fallbacks (deprecated)
+GRIMMORY_URL = os.environ.get("GRIMMORY_URL") or os.environ.get("BOOKLORE_URL")
+GRIMMORY_USERNAME = os.environ.get("GRIMMORY_USERNAME") or os.environ.get("BOOKLORE_USERNAME")
+GRIMMORY_PASSWORD = os.environ.get("GRIMMORY_PASSWORD") or os.environ.get("BOOKLORE_PASSWORD")
+GRIMMORY_LIBRARY_ID = os.environ.get("GRIMMORY_LIBRARY_ID") or os.environ.get("BOOKLORE_LIBRARY_ID")