feat: remove OpenCode assistant mode

backend/services/config_resolver.py

@@ -53,7 +53,7 @@ async def _agent_resource_for(
     assistant_id: str,
     interface_type: str,
 ) -> ModelResource | None:
-    if interface_type not in {"dify", "fastgpt", "opencode"}:
+    if interface_type not in {"dify", "fastgpt"}:
         return None
     binding = await session.get(AssistantModelBinding, (assistant_id, "Agent"))
     resource_id = binding.model_resource_id if binding else None

backend/services/interface_catalog.py

@@ -95,12 +95,6 @@ INTERFACE_DEFINITIONS: list[dict] = [
         "capability": "Agent",
         "fields": AGENT_COMMON + [field("appId", "App ID", required=True)],
     },
-    {
-        "interface_type": "opencode",
-        "name": "OpenCode Agent",
-        "capability": "Agent",
-        "fields": AGENT_COMMON,
-    },
     {
         "interface_type": "stepfun-realtime",
         "name": "StepFun StepAudio Realtime",