Add RuntimeTool model and enhance AssistantConfig for tool management

- Introduce a new `RuntimeTool` model to encapsulate tool data for runtime sessions, including attributes like `id`, `name`, `function_name`, `type`, and `description`.
- Update the `AssistantConfig` model to include a list of reusable tools, allowing for better management of tools within assistant configurations.
- Modify the `config_resolver` service to fetch and resolve tools associated with assistants, ensuring they are available during runtime.
- Refactor tool-related CRUD operations in the `tools` route to support the new runtime execution model, enhancing the overall tool management system.
- Update documentation and comments to reflect changes in tool execution and configuration handling, improving clarity for future development.

backend/services/config_resolver.py

@@ -4,8 +4,14 @@
 助手按 capability binding 引用资源;取不到则回退该能力默认资源。
 """
 
-from db.models import Assistant, AssistantModelBinding, ModelResource
-from models import AssistantConfig
+from db.models import (
+    Assistant,
+    AssistantModelBinding,
+    AssistantToolBinding,
+    ModelResource,
+    Tool,
+)
+from models import AssistantConfig, RuntimeTool
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -75,6 +81,33 @@ def _secret(resource: ModelResource | None, key: str, default: str = "") -> str:
     return str((resource.secrets or {}).get(key) or default)
 
 
+async def _tools_for(session: AsyncSession, assistant: Assistant) -> list[RuntimeTool]:
+    if assistant.type != "prompt":
+        return []
+    tools = (
+        await session.execute(
+            select(Tool)
+            .join(AssistantToolBinding, AssistantToolBinding.tool_id == Tool.id)
+            .where(
+                AssistantToolBinding.assistant_id == assistant.id,
+                Tool.status == "active",
+            )
+            .order_by(AssistantToolBinding.created_at, Tool.id)
+        )
+    ).scalars().all()
+    return [
+        RuntimeTool(
+            id=tool.id,
+            name=tool.name,
+            function_name=tool.function_name,
+            type=tool.type,
+            description=tool.description,
+            definition=tool.definition or {},
+        )
+        for tool in tools
+    ]
+
+
 async def resolve_runtime_config(
     session: AsyncSession, assistant_id: str
 ) -> AssistantConfig:
@@ -102,6 +135,7 @@ async def resolve_runtime_config(
         prompt=assistant.prompt or "你是一个有帮助的助手。",
         runtimeMode=assistant.runtime_mode,  # type: ignore[arg-type]
         enableInterrupt=assistant.enable_interrupt,
+        tools=await _tools_for(session, assistant),
         # workflow 图:仅 workflow 类型非空,引擎据此启用图驱动对话
         graph=(assistant.graph or {}) if assistant.type == "workflow" else {},
         # 外部托管类型连接信息(DB 存真 key,直接注入)