Add Agent capabilities and configurations across the application

- Extend the AssistantConfig model to include agent_interface_type, agent_values, and agent_secrets for enhanced agent management.
- Update ModelType to include "Agent" for broader capability support.
- Seed new agent models and configurations in the database for Dify, FastGPT, and OpenCode applications.
- Modify the Assistant routes to validate and handle agent capabilities.
- Implement agent resource resolution in the config resolver for runtime configuration.
- Enhance the interface catalog with agent-specific fields and definitions.
- Update frontend components to manage agent configurations, including form handling and state management for agent-related inputs.

backend/models.py

@@ -36,6 +36,9 @@ class AssistantConfig(BaseModel):
     realtime_interface_type: str = ""
     realtime_values: dict = {}
     realtime_secrets: dict = {}
+    agent_interface_type: str = ""
+    agent_values: dict = {}
+    agent_secrets: dict = {}
     llm_interface_type: str = "openai-llm"
     stt_interface_type: str = "openai-asr"
     tts_interface_type: str = "openai-tts"