feat: Add API Key support for MCP authentication

- New db model: api_keys table with bcrypt-hashed keys
- New API: POST/GET/DELETE /v3/access/api-keys endpoints
- MCP _resolve_token: validates API keys, resolves to 5-min JWT
- API keys inherit the creating user's RBAC permissions
- MCP auth supports both JWT (24h) and API key (permanent) tokens

gns3server/db/models/__init__.py

@@ -24,6 +24,7 @@ from .computes import Compute
 from .images import Image
 from .pools import Resource, ResourcePool
 from .llm_model_configs import LLMModelConfig
+from .api_keys import ApiKey
 from .templates import (
     Template,
     CloudTemplate,