feat(backend): add saveMode field on plan create-full and update schemas

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/schemas/pl/plan.py

@@ -216,7 +216,7 @@ class PlanBase(BaseModel):
     follow_status: str = Field(
         default="pending_arrange",
         alias="followStatus",
-        description="跟进状态 wait_notice/pending_arrange/arranged/completed/cancelled",
+        description="跟进状态 drafting/wait_notice/pending_arrange/arranged/completed/cancelled",
     )
     transport_status: str = Field(default="pending", alias="transportStatus", description="运输安排状态")
     archive_status: str = Field(default="unarchived", alias="archiveStatus", description="归档状态 unarchived/draft/archived")
@@ -344,6 +344,11 @@ class PlanUpdate(BaseModel):
     transport: Optional[PlanTransportCreateBlock] = Field(default=None, description="运输预选/更新（有车牌时同步车辆与运费）")
     load: Optional[PlanLoadBody] = Field(default=None, description="装货段")
     deliveries: Optional[list[PlanDeliveryBody]] = Field(default=None, description="送货段列表")
+    save_mode: Optional[str] = Field(
+        default="formal",
+        alias="saveMode",
+        description="保存模式 draft=暂存 formal=正式（默认）",
+    )
     model_config = {"populate_by_name": True}
 
 
@@ -498,6 +503,11 @@ class CreateFromContractRequest(BaseModel):
 class PlanCreateFull(PlanCreate):
     contract_id: Optional[str] = Field(default=None, alias="contractId", description="旧字段：单一合同ID，已废弃为唯一源")
     transport: Optional[PlanTransportCreateBlock] = Field(default=None, description="运输安排（有车牌时创建运输）")
+    save_mode: Optional[str] = Field(
+        default="formal",
+        alias="saveMode",
+        description="保存模式 draft=暂存 formal=正式（默认）",
+    )
     model_config = {"populate_by_name": True}
 
 
@@ -657,7 +667,7 @@ class PlanForceFollowStatusBody(BaseModel):
     follow_status: str = Field(
         ...,
         alias="followStatus",
-        description="跟进状态 wait_notice/pending_arrange/arranged/completed/cancelled",
+        description="跟进状态 drafting/wait_notice/pending_arrange/arranged/completed/cancelled",
     )
     model_config = {"populate_by_name": True}