feat: 系统参数独立表与迁移

src/Infrastructure/TakeoutSaaS.Infrastructure/Dictionary/Persistence/DictionaryDbContext.cs

@@ -1,6 +1,7 @@
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Metadata.Builders;
 using TakeoutSaaS.Domain.Dictionary.Entities;
+using TakeoutSaaS.Domain.SystemParameters.Entities;
 using TakeoutSaaS.Infrastructure.Common.Persistence;
 using TakeoutSaaS.Shared.Abstractions.Ids;
 using TakeoutSaaS.Shared.Abstractions.Security;
@@ -9,7 +10,7 @@ using TakeoutSaaS.Shared.Abstractions.Tenancy;
 namespace TakeoutSaaS.Infrastructure.Dictionary.Persistence;
 
 /// <summary>
-/// 参数字典 DbContext。
+/// 参数字典 DbContext：承载字典与系统参数。
 /// </summary>
 public sealed class DictionaryDbContext(
     DbContextOptions<DictionaryDbContext> options,
@@ -19,15 +20,20 @@ public sealed class DictionaryDbContext(
     : TenantAwareDbContext(options, tenantProvider, currentUserAccessor, idGenerator)
 {
     /// <summary>
-    /// 字典分组集。
+    /// 字典分组集合。
     /// </summary>
     public DbSet<DictionaryGroup> DictionaryGroups => Set<DictionaryGroup>();
 
     /// <summary>
-    /// 字典项集。
+    /// 字典项集合。
     /// </summary>
     public DbSet<DictionaryItem> DictionaryItems => Set<DictionaryItem>();
 
+    /// <summary>
+    /// 系统参数集合。
+    /// </summary>
+    public DbSet<SystemParameter> SystemParameters => Set<SystemParameter>();
+
     /// <summary>
     /// 配置实体模型。
     /// </summary>
@@ -37,6 +43,7 @@ public sealed class DictionaryDbContext(
         base.OnModelCreating(modelBuilder);
         ConfigureGroup(modelBuilder.Entity<DictionaryGroup>());
         ConfigureItem(modelBuilder.Entity<DictionaryItem>());
+        ConfigureSystemParameter(modelBuilder.Entity<SystemParameter>());
         ApplyTenantQueryFilters(modelBuilder);
     }
 
@@ -87,4 +94,25 @@ public sealed class DictionaryDbContext(
         builder.HasIndex(x => x.TenantId);
         builder.HasIndex(x => new { x.GroupId, x.Key }).IsUnique();
     }
+
+    /// <summary>
+    /// 配置系统参数。
+    /// </summary>
+    /// <param name="builder">实体构建器。</param>
+    private static void ConfigureSystemParameter(EntityTypeBuilder<SystemParameter> builder)
+    {
+        builder.ToTable("system_parameters");
+        builder.HasKey(x => x.Id);
+        builder.Property(x => x.TenantId).IsRequired();
+        builder.Property(x => x.Key).HasMaxLength(128).IsRequired();
+        builder.Property(x => x.Value).HasColumnType("text").IsRequired();
+        builder.Property(x => x.Description).HasMaxLength(512);
+        builder.Property(x => x.SortOrder).HasDefaultValue(100);
+        builder.Property(x => x.IsEnabled).HasDefaultValue(true);
+        ConfigureAuditableEntity(builder);
+        ConfigureSoftDeleteEntity(builder);
+
+        builder.HasIndex(x => x.TenantId);
+        builder.HasIndex(x => new { x.TenantId, x.Key }).IsUnique();
+    }
 }