feat(auth): add get_current_user_from_api_token dependency

- Validates API tokens (or_api_* prefix)
- SHA-256 hash lookup in api_tokens table
- Updates last_used_at on each request
- Distinguishes from JWT tokens (401 with clear error)

src/openrouter_monitor/dependencies/__init__.py

@@ -1,4 +1,22 @@
 """Dependencies package for OpenRouter Monitor."""
-from openrouter_monitor.dependencies.auth import get_current_user, security
+from openrouter_monitor.dependencies.auth import (
+    get_current_user,
+    get_current_user_from_api_token,
+    security,
+    api_token_security,
+)
+from openrouter_monitor.dependencies.rate_limit import (
+    RateLimiter,
+    rate_limit_dependency,
+    rate_limiter,
+)
 
-__all__ = ["get_current_user", "security"]
+__all__ = [
+    "get_current_user",
+    "get_current_user_from_api_token",
+    "security",
+    "api_token_security",
+    "RateLimiter",
+    "rate_limit_dependency",
+    "rate_limiter",
+]