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_interface_definitions.sql

@@ -40,6 +40,22 @@ VALUES
      {"key":"apiKey","label":"API Key","group":"secrets","type":"password","required":true},
      {"key":"voice","label":"Voice","group":"values","type":"text","required":false}
    ]} $$::jsonb, TRUE, 1),
+  ('dify', 'Dify Agent', 'Agent',
+   $$ {"fields":[
+     {"key":"apiUrl","label":"API URL","group":"values","type":"url","required":true},
+     {"key":"apiKey","label":"API Key","group":"secrets","type":"password","required":true}
+   ]} $$::jsonb, TRUE, 1),
+  ('fastgpt', 'FastGPT Agent', 'Agent',
+   $$ {"fields":[
+     {"key":"apiUrl","label":"API URL","group":"values","type":"url","required":true},
+     {"key":"apiKey","label":"API Key","group":"secrets","type":"password","required":true},
+     {"key":"appId","label":"App ID","group":"values","type":"text","required":true}
+   ]} $$::jsonb, TRUE, 1),
+  ('opencode', 'OpenCode Agent', 'Agent',
+   $$ {"fields":[
+     {"key":"apiUrl","label":"API URL","group":"values","type":"url","required":true},
+     {"key":"apiKey","label":"API Key","group":"secrets","type":"password","required":true}
+   ]} $$::jsonb, TRUE, 1),
   ('stepfun-realtime', 'StepFun StepAudio Realtime', 'Realtime',
    $$ {"fields":[
      {"key":"modelId","label":"Model ID","group":"values","type":"text","required":true},