Enhance API and configuration for Telegram miniapp

- Added support for CORS origins and a new environment variable for miniapp access control.
- Implemented date validation for API requests to ensure correct date formats.
- Updated FastAPI app to allow access without Telegram initData for local development.
- Enhanced error handling and logging for better debugging.
- Added tests for API functionality and Telegram initData validation.
- Updated README with new environment variable details and testing instructions.
- Modified Docker and Git ignore files to include additional directories and files.

.dockerignore

@@ -1,4 +1,5 @@
 venv/
+.venv/
 .env
 .git/
 __pycache__/
@@ -8,3 +9,4 @@ __pycache__/
 .cursor/
 *.plan.md
 data/
+.curosr/