Enhance AssistantConfig and pipeline for FastGPT integration

- Add new fields in AssistantConfig for FastGPT connection details, including `fastgpt_api_url`, `fastgpt_api_key`, and `fastgpt_app_id`.
- Update the pipeline to utilize the new FastGPT configuration, ensuring proper integration with external services.
- Introduce type handling for different assistant types, including support for realtime modes and external brain management.
- Refactor frontend components to include hints for FastGPT configuration inputs, improving user guidance during setup.

backend/services/config_resolver.py

@@ -61,6 +61,7 @@ async def resolve_runtime_config(
 
     return AssistantConfig(
         name=assistant.name,
+        type=assistant.type,
         greeting=assistant.greeting,
         # prompt 现在是真列;外部类型由其平台编排,这里给个兜底
         prompt=assistant.prompt or "你是一个有帮助的助手。",
@@ -68,6 +69,10 @@ async def resolve_runtime_config(
         enableInterrupt=assistant.enable_interrupt,
         # 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)
+        fastgpt_api_url=assistant.api_url,
+        fastgpt_api_key=assistant.api_key,
+        fastgpt_app_id=assistant.app_id,
         # 模型/音色:模型资源中的配置优先
         model=str(_value(llm_resource, "modelId", "")),
         asr=str(_value(stt_resource, "modelId", "")),