重构作业结构：优化实体模型、DTO映射和前端界面

- 重构AppMainStruct、AssignmentQuestion、Question等实体模型
- 更新相关DTO以匹配新的数据结构
- 优化前端页面布局和组件
- 添加全局信息和笔记功能相关代码
- 更新数据库迁移和程序配置

TechHelper.Server/Migrations/ApplicationContextModelSnapshot.cs

@@ -219,6 +219,9 @@ namespace TechHelper.Server.Migrations
                         .HasColumnType("varchar(1024)")
                         .HasColumnName("title");
 
+                    b.Property<byte>("Type")
+                        .HasColumnType("tinyint unsigned");
+
                     b.HasKey("Id");
 
                     b.HasIndex("AssignmentId");
@@ -332,6 +335,25 @@ namespace TechHelper.Server.Migrations
                     b.ToTable("class_teachers", (string)null);
                 });
 
+            modelBuilder.Entity("Entities.Contracts.Global", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("char(36)")
+                        .HasColumnName("id");
+
+                    b.Property<byte>("Area")
+                        .HasColumnType("tinyint unsigned");
+
+                    b.Property<string>("Info")
+                        .IsRequired()
+                        .HasColumnType("longtext");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("global");
+                });
+
             modelBuilder.Entity("Entities.Contracts.KeyPoint", b =>
                 {
                     b.Property<Guid>("Id")
@@ -445,6 +467,10 @@ namespace TechHelper.Server.Migrations
                         .HasColumnType("longtext")
                         .HasColumnName("options");
 
+                    b.Property<string>("QType")
+                        .IsRequired()
+                        .HasColumnType("longtext");
+
                     b.Property<byte>("SubjectArea")
                         .HasMaxLength(100)
                         .HasColumnType("tinyint unsigned")
@@ -723,6 +749,9 @@ namespace TechHelper.Server.Migrations
                     b.Property<string>("SecurityStamp")
                         .HasColumnType("longtext");
 
+                    b.Property<byte>("SubjectArea")
+                        .HasColumnType("tinyint unsigned");
+
                     b.Property<bool>("TwoFactorEnabled")
                         .HasColumnType("tinyint(1)");
 
@@ -771,19 +800,19 @@ namespace TechHelper.Server.Migrations
                     b.HasData(
                         new
                         {
-                            Id = new Guid("df89b9a0-65ef-42dd-b2cb-e59997a72e70"),
+                            Id = new Guid("8c6c5e8e-ef00-444c-9c7c-cba5cd6f7043"),
                             Name = "Student",
                             NormalizedName = "STUDENT"
                         },
                         new
                         {
-                            Id = new Guid("0775702a-5db7-4747-94d0-4376fad2b58b"),
+                            Id = new Guid("2670f35a-df0c-4071-8879-80eb99d138a1"),
                             Name = "Teacher",
                             NormalizedName = "TEACHER"
                         },
                         new
                         {
-                            Id = new Guid("37f41430-0cb7-44e5-988b-976200bd602d"),
+                            Id = new Guid("9eda9d90-0cd2-4fbe-b07e-f90bd01f32db"),
                             Name = "Administrator",
                             NormalizedName = "ADMINISTRATOR"
                         });