chore: 基线提交（重构前快照）

重构前保存现有 apps/ 结构基线，供后续各阶段回滚。

Co-Authored-By: Claude <noreply@anthropic.com>

apps/forms/city.py

@@ -0,0 +1,18 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# 城市表单验证
+class CityForm(BaseModel):
+    id: Optional[int] = Field(None, description="城市ID")
+    name: str = Field(..., min_length=1, max_length=150, description="城市名称")
+    short_name: str = Field(..., min_length=1, max_length=150, description="城市简称")
+    pinyin: str = Field(..., min_length=1, max_length=150, description="城市拼音")
+    city_code: str = Field(..., min_length=1, max_length=6, description="城市区号")
+    area_code: str = Field(..., min_length=1, max_length=20, description="行政编码")
+    zip_code: str = Field(..., min_length=1, max_length=6, description="城市邮编")
+    level: int = Field(..., ge=1, le=4, description="城市级别")
+    lng: str = Field(..., min_length=1, max_length=150, description="城市经度")
+    lat: str = Field(..., min_length=1, max_length=150, description="城市纬度")
+    pid: Optional[int] = Field(None, description="上级ID")