Add vision model support and related configurations in Assistant

- Introduce new fields in AssistantConfig, schemas, and database models to support vision capabilities, including `vision_enabled` and `vision_model_resource_id`.
- Enhance validation logic in routes to ensure proper handling of vision models and their requirements.
- Update the AssistantPage and related frontend components to include options for enabling vision understanding and selecting appropriate vision models.
- Modify database seed scripts to include vision-related data for assistants, ensuring consistent setup.
- Refactor related functions to integrate vision model handling in the audio-visual processing pipeline.

backend/db/models.py

@@ -97,6 +97,12 @@ class Assistant(Base):
     runtime_mode: Mapped[str] = mapped_column(String(16), default="pipeline")
     greeting: Mapped[str] = mapped_column(String(2048), default="")
     enable_interrupt: Mapped[bool] = mapped_column(Boolean, default=True)
+    vision_enabled: Mapped[bool] = mapped_column(Boolean, default=False)
+    vision_model_resource_id: Mapped[str | None] = mapped_column(
+        String(40),
+        ForeignKey("model_resources.id", ondelete="SET NULL"),
+        nullable=True,
+    )
 
     # KB 引用:被引用时禁止删 KB(RESTRICT),无默认兜底
     knowledge_base_id: Mapped[str | None] = mapped_column(

backend/db/seed_assistants.sql

@@ -8,18 +8,24 @@ ON CONFLICT (id) DO NOTHING;
 
 INSERT INTO assistants (
   id, name, type, runtime_mode, greeting, enable_interrupt,
+  vision_enabled, vision_model_resource_id,
   knowledge_base_id, prompt, api_url, api_key, app_id, graph
 ) VALUES
   ('asst_001', '政务咨询助手', 'prompt', 'pipeline', '您好，我是政务助手，请问有什么可以帮您？', TRUE,
+   FALSE, NULL,
    'kb_001', '你是一名专业的政务咨询助手，回答准确、简洁，不编造政策内容。', '', '', '', '{}'),
   ('asst_002', '热线工单助手', 'workflow', 'pipeline', '', TRUE,
+   FALSE, NULL,
    NULL, '', '', '', '',
    '{"nodes":[{"id":"1","type":"startCall","position":{"x":0,"y":0},"data":{"name":"开场","prompt":"你好，请问需要办理什么业务？"}}],"edges":[]}'),
   ('asst_003', 'Dify 客服助手', 'dify', 'pipeline', '', TRUE,
+   FALSE, NULL,
    NULL, '', 'https://api.dify.ai/v1', 'app-dify-demo-key', '', '{}'),
   ('asst_004', 'FastGPT 售后助手', 'fastgpt', 'pipeline', '', TRUE,
+   FALSE, NULL,
    NULL, '', 'https://api.fastgpt.in/api/v1/chat/completions', 'fastgpt-demo-key', 'app-fastgpt-001', '{}'),
   ('asst_005', 'OpenCode 代码助手', 'opencode', 'pipeline', '', TRUE,
+   FALSE, NULL,
    NULL, '你是一个代码助手的语音界面，用简洁口语回答工程问题。', 'http://localhost:4096', 'opencode-demo-key', '', '{}')
 ON CONFLICT (id) DO NOTHING;