feat: Implement project management with new models, repositories, and API endpoints, and enhance character management with project association and DTOs.

models/Character.py

@@ -5,11 +5,13 @@ from pydantic_core.core_schema import computed_field
 
 
 class Character(BaseModel):
-    id: str | None
+    id: Optional[str] = None
     name: str
     avatar_image: Optional[str] = None
     character_image_data: Optional[bytes] = None
-    character_image_doc_tg_id: str
-    character_image_tg_id: str | None
-    character_bio: str
+    character_image_doc_tg_id: Optional[str] = None
+    character_image_tg_id: Optional[str] = None
+    character_bio: Optional[str] = None
+    created_by: Optional[str] = None
+    project_id: Optional[str] = None