feat(finance): add overview dashboard and platform fee rate

src/Infrastructure/TakeoutSaaS.Infrastructure/Migrations/TakeoutAppDbContextModelSnapshot.cs

@@ -7666,6 +7666,11 @@ namespace TakeoutSaaS.Infrastructure.Migrations
                         .HasColumnType("numeric(10,2)")
                         .HasComment("基础配送费（元）。");
 
+                    b.Property<decimal>("PlatformServiceRate")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("numeric(5,2)")
+                        .HasComment("平台服务费率（%）。");
+
                     b.Property<DateTime>("CreatedAt")
                         .HasColumnType("timestamp with time zone")
                         .HasComment("创建时间（UTC）。");