[feat]:[FL-172][用户管理页面新增用户时邮箱放最后，且不要必填]

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: multica-agent <github@multica.ai>

api/app/models/user.py

@@ -28,7 +28,7 @@ class User(Base):
         primary_key=True,
         default=lambda: uuid4().hex,
     )
-    email: Mapped[str] = mapped_column(String(255), unique=True, index=True)
+    email: Mapped[str | None] = mapped_column(String(255), unique=True, index=True, nullable=True)
     username: Mapped[str] = mapped_column(
         settings.user_username_column,
         String(64),

api/app/schemas/user.py

@@ -36,7 +36,7 @@ class UserPasswordResetRequest(BaseModel):
 
 class UserCreateRequest(BaseModel):
     user_id: str = Field(min_length=3, max_length=64)
-    email: str
+    email: str | None = None
     username: str = Field(min_length=3, max_length=64)
     password: str = Field(min_length=8, max_length=128)
 

api/app/services/user_service.py

@@ -95,17 +95,20 @@ def create_user(
 ) -> UserPublic | None:
     user_id = payload.user_id.strip()
 
+    # Build conditions for duplicate check
+    conditions = [User.id == user_id, User.username == payload.username]
+    if payload.email:
+        conditions.append(User.email == payload.email.lower())
+
     duplicate = db.scalar(
-        select(User.id).where(
-            (User.id == user_id) | (User.email == payload.email.lower()) | (User.username == payload.username)
-        )
+        select(User.id).where(or_(*conditions))
     )
     if duplicate:
         return None
 
     user = User(
         id=user_id,
-        email=payload.email.lower(),
+        email=payload.email.lower() if payload.email else None,
         username=payload.username,
         password_hash=hash_password(payload.password),
         status="ENABLED",