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/db/seed_model_resources.sql

@@ -41,6 +41,15 @@ VALUES
    '{"apiKey":"replace-me"}', FALSE, TRUE, FALSE),
   ('model_013', 'doubao-seed-2-0-mini-260428', 'LLM', 'openai-llm',
    '{"modelId":"doubao-seed-2-0-mini-260428","apiUrl":"https://ark.cn-beijing.volces.com/api/v3","temperature":0.7,"extraBody":{"thinking":{"type":"disabled"}}}',
-   '{"apiKey":"replace-me"}', TRUE, TRUE, FALSE)
+   '{"apiKey":"replace-me"}', TRUE, TRUE, FALSE),
+  ('model_014', 'Dify 客服应用', 'Agent', 'dify',
+   '{"apiUrl":"https://api.dify.ai/v1/chat-messages"}',
+   '{"apiKey":"replace-me"}', FALSE, TRUE, FALSE),
+  ('model_015', 'FastGPT 售后应用', 'Agent', 'fastgpt',
+   '{"apiUrl":"https://api.fastgpt.in/api/v1/chat/completions","appId":"app-fastgpt-001"}',
+   '{"apiKey":"replace-me"}', FALSE, TRUE, FALSE),
+  ('model_016', 'OpenCode 服务', 'Agent', 'opencode',
+   '{"apiUrl":"http://localhost:4096"}',
+   '{"apiKey":"replace-me"}', FALSE, TRUE, FALSE)
 -- Seed defaults must never overwrite resources configured through the UI.
 ON CONFLICT (id) DO NOTHING;