Add workflow support and enhance runtime configuration in models and services

- Introduce RuntimeModelResource and RuntimeKnowledgeBase classes to manage workflow resources.
- Update AssistantConfig to include workflow_model_resources and workflow_knowledge_bases for better integration.
- Refactor validation and processing logic in routes and services to accommodate workflow types.
- Implement dynamic variable support for workflow assistants and enhance graph normalization.
- Add ToolExecutor for reusable tool execution across different assistant types.
- Update various services to ensure compatibility with new workflow features and improve error handling.

backend/routes/model_registry.py

@@ -3,6 +3,7 @@
 import uuid
 
 from db.models import (
+    Assistant,
     AssistantModelBinding,
     InterfaceDefinition,
     KnowledgeBase,
@@ -20,6 +21,7 @@ from services.auth import require_admin
 from services.interface_catalog import validate_fields
 from services.masking import mask_secrets, merge_secrets
 from services.model_resource_tester import test_model_resource
+from services.node_specs import graph_references
 from sqlalchemy import delete, select, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -102,6 +104,14 @@ async def _clear_incompatible_references(
 ) -> None:
     if capability == resource.capability:
         return
+    workflows = (
+        await session.execute(select(Assistant).where(Assistant.type == "workflow"))
+    ).scalars().all()
+    if any(
+        resource.id in graph_references(assistant.graph or {})["model_resources"]
+        for assistant in workflows
+    ):
+        raise HTTPException(409, "模型资源正被 Workflow 节点引用，不能修改能力类型")
     await session.execute(
         delete(AssistantModelBinding).where(
             AssistantModelBinding.model_resource_id == resource.id
@@ -263,6 +273,14 @@ async def delete_model_resource(
     ).scalar_one_or_none()
     if in_use:
         raise HTTPException(409, "该模型资源仍被助手引用")
+    workflows = (
+        await session.execute(select(Assistant).where(Assistant.type == "workflow"))
+    ).scalars().all()
+    if any(
+        resource_id in graph_references(assistant.graph or {})["model_resources"]
+        for assistant in workflows
+    ):
+        raise HTTPException(409, "该模型资源仍被 Workflow 节点引用")
     await session.delete(row)
     await session.commit()
     return {"ok": True}