feat: P2-12 Teacher profile/workspace + P2-13 Multi-class comparison

P2-12 Teacher Management:
- Add profile JSON field (subjects, joinedAt, qualifications) to User entity
- Add GET/PUT /rbac/users/:id/profile endpoints with UpdateProfileDto
- Add GET /rbac/teacher-workspace endpoint returning assignedClasses,
  todaySchedules, and myStudents
- Create /teacher-workspace page with tabs (My Classes, Today's Schedule,
  My Students)
- Add route with PermissionRoute and menu item in MainLayout

P2-13 Student Archive Multi-class:
- Add GET /students/:id/compare-classes endpoint returning side-by-side
  enrollment data with per-class attendance statistics
- Students module now includes ClassStudent and AttendanceRecord entities
- No 2-enrollment cap existed in the codebase; student enrollments
  already return all records via class-student table

apps/server/src/rbac/rbac.module.ts

@@ -1,12 +1,12 @@
 import { Module, OnModuleInit, forwardRef } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
-import { Permission, Role, User } from '../entities';
+import { Permission, Role, User, Class, ClassStudent, ClassTeacher, ClassSchedule, Student } from '../entities';
 import { RbacService } from './rbac.service';
 import { RbacController } from './rbac.controller';
 import { AuthModule } from '../auth/auth.module';
 
 @Module({
-  imports: [TypeOrmModule.forFeature([Permission, Role, User]), forwardRef(() => AuthModule)],
+  imports: [TypeOrmModule.forFeature([Permission, Role, User, Class, ClassStudent, ClassTeacher, ClassSchedule, Student]), forwardRef(() => AuthModule)],
   controllers: [RbacController],
   providers: [RbacService],
   exports: [RbacService],