feat: 将数据库模型和迁移集中到 EFCore 项目

- 将 AppDataContext、实体模型、Migrations 从 Avalonia-Services 移动到 Avalonia-EFCore
- 更新 API、PC、Services 中的数据库上下文和实体引用命名空间
- 在实体上显式绑定表名、字段名和数据库注释
- 更新 InitialCreate、Designer、Snapshot，使用新的表名、字段名和注释
- 新增 AppDataContextFactory，支持 dotnet ef 设计时创建 DbContext
- 新增本地 dotnet-ef 工具清单
- 新增一键生成迁移脚本 add-migration.ps1 / .cmd / .bat
- 启动时自动检测并执行未应用迁移
- 从 appsettings.json 读取数据库配置

Avalonia-Services/Database/AppDataContext.cs

@@ -1,37 +0,0 @@
-using Avalonia_EFCore.Database;
-using Avalonia_Services.Models;
-using Microsoft.EntityFrameworkCore;
-
-namespace Avalonia_Services.Database
-{
-    /// <summary>
-    /// 应用数据库上下文 —— 继承自 Avalonia-EFCore 的 AppDbContext。
-    /// 所有业务实体在此注册 DbSet。
-    /// 这是 Avalonia-API 和 Avalonia-PC 共用的具体数据上下文。
-    /// </summary>
-    public class AppDataContext(DatabaseConfiguration dbConfig) : AppDbContext(dbConfig)
-    {
-        /// <summary>天气预报数据</summary>
-        public DbSet<WeatherForecastEntity> WeatherForecasts => Set<WeatherForecastEntity>();
-
-        /// <summary>用户数据</summary>
-        public DbSet<UserEntity> Users => Set<UserEntity>();
-
-        protected override void OnModelCreating(ModelBuilder modelBuilder)
-        {
-            base.OnModelCreating(modelBuilder);
-
-            modelBuilder.Entity<WeatherForecastEntity>(entity =>
-            {
-                entity.HasKey(e => e.Id);
-                entity.Property(e => e.Summary).HasMaxLength(200);
-            });
-
-            modelBuilder.Entity<UserEntity>(entity =>
-            {
-                entity.HasKey(e => e.Id);
-                entity.Property(e => e.Email).HasMaxLength(200);
-            });
-        }
-    }
-}

Avalonia-Services/Endpoints/AppEndpoints.cs

@@ -1,7 +1,7 @@
 using Avalonia_Common.Core;
+using Avalonia_EFCore.Database;
+using Avalonia_EFCore.Models;
 using Avalonia_Services.Core;
-using Avalonia_Services.Database;
-using Avalonia_Services.Models;
 using Avalonia_Services.Services;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;

Avalonia-Services/Models/UserEntity.cs

@@ -1,26 +0,0 @@
-using System.ComponentModel.DataAnnotations;
-using System.ComponentModel.DataAnnotations.Schema;
-
-namespace Avalonia_Services.Models
-{
-    /// <summary>
-    /// 用户实体 —— 演示数据库 CRUD 操作。
-    /// </summary>
-    [Table("Users")]
-    public class UserEntity
-    {
-        [Key]
-        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
-        public int Id { get; set; }
-
-        [MaxLength(100)]
-        public string? Name { get; set; }
-
-        [MaxLength(200)]
-        public string? Email { get; set; }
-
-        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
-
-        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
-    }
-}

Avalonia-Services/Models/WeatherForecast.cs

@@ -1,13 +0,0 @@
-namespace Avalonia_Services.Models
-{
-    public class WeatherForecast
-    {
-        public DateOnly Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string? Summary { get; set; }
-    }
-}

Avalonia-Services/Models/WeatherForecastEntity.cs

@@ -1,27 +0,0 @@
-using System.ComponentModel.DataAnnotations;
-using System.ComponentModel.DataAnnotations.Schema;
-
-namespace Avalonia_Services.Models
-{
-    /// <summary>
-    /// 天气预报数据实体 —— 对应数据库中的 WeatherForecasts 表。
-    /// </summary>
-    [Table("WeatherForecasts")]
-    public class WeatherForecastEntity
-    {
-        [Key]
-        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
-        public int Id { get; set; }
-
-        public DateOnly Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        [MaxLength(200)]
-        public string? Summary { get; set; }
-
-        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
-
-        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
-    }
-}

Avalonia-Services/Services/WeatherForecastService.cs

@@ -1,4 +1,4 @@
-using Avalonia_Services.Models;
+using Avalonia_EFCore.Models;
 
 namespace Avalonia_Services.Services
 {