feat(api): implement API key management and authentication enhancements

- Added endpoints for managing API keys, including creation, retrieval, updating, and revocation.
- Introduced a new Auth session endpoint to retrieve current tenant and role information.
- Updated the authentication middleware to support API key-based authentication and track last used timestamps.
- Enhanced documentation to reflect new API key functionalities and usage guidelines.
- Improved logging for demo authentication scenarios.

migrations/sqlite/000013_api_key.down.sql

@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS idx_api_key_tenant_active;
+DROP INDEX IF EXISTS idx_api_key_token_hash;
+DROP TABLE IF EXISTS api_key;