fix: 无邮箱注册改用占位邮箱，避免空串撞 uk_user_email

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

sql/20260729_fix_user_empty_email.sql

@@ -0,0 +1,12 @@
+-- 修复：微信注册无邮箱时曾写入 user.Email=''，撞 uk_user_email 导致后续注册提示「邮箱已被占用」
+-- 将空邮箱改为「客户编号@noemail.local」占位（与 CustomerContactHelper.ResolveRbacEmailOrPlaceholder 一致）
+
+UPDATE `user` u
+INNER JOIN `t_customer` c ON c.`UserId` = u.`userid`
+SET u.`Email` = CONCAT(LOWER(TRIM(c.`CustomerCode`)), '@noemail.local')
+WHERE u.`Email` IS NULL OR TRIM(u.`Email`) = '';
+
+-- 无客户关联的残留空邮箱
+UPDATE `user`
+SET `Email` = CONCAT('u', `userid`, '@noemail.local')
+WHERE `Email` IS NULL OR TRIM(`Email`) = '';

src/Oms.Application/Services/Customers/CustomerService.cs

@@ -193,6 +193,17 @@ public class CustomerService : ApplicationService
         customer.Phone = phone;
         customer.Email = email;
         await CustomerRepository.UpdateAsync(customer);
+
+        // 同步 RBAC 登录邮箱，覆盖注册时的 @noemail.local 占位
+        try
+        {
+            await RbacDbContext.Database.ExecuteSqlInterpolatedAsync(
+                $"UPDATE `user` SET `Email` = {email} WHERE `userid` = {customer.UserId} AND `IsDeleted` = 0");
+        }
+        catch
+        {
+            // 客户资料已更新；RBAC 同步失败不阻断补全
+        }
     }
 
     /// <summary>

src/Oms.Application/Shared/CustomerContactHelper.cs

@@ -37,4 +37,32 @@ public static class CustomerContactHelper
         if (trimmed.Equals("undefined", StringComparison.OrdinalIgnoreCase)) return null;
         return trimmed;
     }
+
+    /// <summary>
+    /// RBAC <c>user.Email</c> 有唯一索引，空串会撞库。
+    /// 无真实邮箱时用客户编号生成占位，禁止写入 <c>''</c>。
+    /// </summary>
+    public static string ResolveRbacEmailOrPlaceholder(string? email, string customerCode)
+    {
+        var normalized = NormalizeOptionalContact(email);
+        if (normalized != null)
+        {
+            return normalized;
+        }
+
+        var code = (customerCode ?? string.Empty).Trim().ToLowerInvariant();
+        if (string.IsNullOrEmpty(code))
+        {
+            code = Guid.NewGuid().ToString("N")[..12];
+        }
+
+        return $"{code}@noemail.local";
+    }
+
+    public static bool IsPlaceholderRbacEmail(string? email)
+    {
+        var value = email?.Trim();
+        return !string.IsNullOrEmpty(value)
+               && value.EndsWith("@noemail.local", StringComparison.OrdinalIgnoreCase);
+    }
 }

src/SimpleAdmin.Api/WeChat/WeChatCustomerService.cs

@@ -130,7 +130,8 @@ public class WeChatCustomerService(
                 Name = customerName,
                 Account = customerCode,
                 Password = password,
-                Email = email ?? string.Empty,
+                // 禁止 Email=''：uk_user_email 会把第二条空邮箱当成占用
+                Email = CustomerContactHelper.ResolveRbacEmailOrPlaceholder(email, customerCode),
                 RoleIds = [customerRoleId]
             });