From 1fe5e1b031867094c3bbf5036422189d75b4504c Mon Sep 17 00:00:00 2001
From: Luca Sacchi Ricciardi <luca@lucasacchi.net>
Date: Tue, 7 Apr 2026 13:57:56 +0200
Subject: [PATCH] feat(deps): T21 implement get_current_user dependency

Add authentication dependency with:
- HTTPBearer for token extraction from Authorization header
- JWT token decoding with decode_access_token()
- User ID extraction from 'sub' claim
- Database user lookup with existence check
- Active user verification
- HTTPException 401 for invalid/expired tokens or inactive users

Used as FastAPI dependency: Depends(get_current_user)

Location: src/openrouter_monitor/dependencies/auth.py