feat: workflow和chat分离

1，增加了创建workflow的页面
2.删除了event

kilostar/core/postgres_database/model/individual.py

@@ -14,7 +14,7 @@
 
 from enum import Enum
 from typing import List, Optional, Dict, Any
-from sqlalchemy import String, Text, text, ForeignKey
+from sqlalchemy import String, Text, text, ForeignKey, Enum as SAEnum
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
@@ -119,7 +119,8 @@ class SpecialIndividualModel(BaseIndividualModel):
         ForeignKey("base_individual.agent_id", ondelete="CASCADE"), primary_key=True
     )
     modality_type: Mapped[ModalityType] = mapped_column(
-        default=ModalityType.MULTIMODAL, server_default=text("'multimodal'")
+        SAEnum(ModalityType),
+        default=ModalityType.MULTIMODAL,
     )
     multimodal_config: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSONB)