Add OAuth server implementation and Docker Compose configuration

- Introduced a new `compose.yaml` file to define the Docker service for the OAuth server.
- Created `oauth.py` to implement a single-user OAuth authorization server with PKCE, SQLite persistence, and token management.
- Added necessary database schema for OAuth clients, flows, codes, tokens, and login failures.
- Implemented login routes with CSRF protection and error handling.
- Updated `requirements.txt` to include dependencies for the OAuth server.

.gitignore

@@ -0,0 +1,10 @@
+.env
+.env.*
+!.env.example
+secrets/
+data/
+__pycache__/
+*.py[cod]
+.env
+.env.example
+