新增农户功能升级：身份证OCR/OSS上传、头像采集、同名村检测、Region热度排序及表单体验优化

- Region 表新增热度列，热门省份优先显示
- 区县下拉按地级市分组、已录区县优先、支持全省搜索
- 组选择内置一组至二十组
- 银行卡号独立行+粗体预览，开户行独立行
- 新增农户类型：农户/个体户/合作社/经营集体/公司
- 身份证正反面支持高拍仪/摄像头OCR与手机扫码上传，附件存本地/OSS
- 新增农户头像采集组件（摄像头/本地上传），预留人脸识别收购扩展
- 同名村弹窗提醒（防选错乡镇）
- 编辑窗体禁止遮罩/Esc误关，整体加宽适配高频操作
- 修复二维码局域网手机无法访问（监听0.0.0.0、局域网IP识别、Vite代理兜底）

backend/AgriculturalPlatform.Api/Dtos/FarmerDtos.cs

@@ -0,0 +1,30 @@
+using AgriculturalPlatform.Api.Models;
+
+namespace AgriculturalPlatform.Api.Dtos;
+
+public record FarmerDto(
+    int Id, string Name, string IdCard, string Gender, string FarmerType, string Phone,
+    string Province, string County, string Township, string Village, string GroupName,
+    string Address, string BankName, string BankAccount, int CreditScore,
+    string IdCardFrontUrl, string IdCardBackUrl, string AvatarUrl,
+    string Status, string Notes, DateTime CreatedAt);
+
+public record FarmerSaveRequest(
+    string Name, string IdCard, string Gender, string Phone,
+    string Province, string County, string Township, string Village, string GroupName,
+    string Address, string BankName, string BankAccount, int CreditScore = 80,
+    string FarmerType = "农户",
+    string IdCardFrontUrl = "", string IdCardBackUrl = "", string AvatarUrl = "",
+    string Status = "Active", string Notes = "");
+
+public static class FarmerMappers
+{
+    public static FarmerDto ToDto(this Farmer f) => new(
+        f.Id, f.Name, f.IdCard, f.Gender, f.FarmerType, f.Phone,
+        f.Province, f.County, f.Township, f.Village, f.GroupName,
+        f.Address, f.BankName, f.BankAccount, f.CreditScore,
+        f.IdCardFrontUrl, f.IdCardBackUrl, f.AvatarUrl,
+        f.Status.ToString(), f.Notes, f.CreatedAt);
+
+    public static FarmerDto[] ToDtos(this IEnumerable<Farmer> items) => items.Select(ToDto).ToArray();
+}