feat(task1): restructure directories for turborepo monorepo

- Move backend/ to apps/server/ via git mv
- Move frontend/ to apps/admin/ via git mv
- Create packages/typescript-config/ with base, nestjs, and react-vite presets

apps/server/src/entities/student.entity.ts

@@ -0,0 +1,55 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, OneToMany } from 'typeorm';
+import { Occupancy } from './occupancy.entity';
+import { PersonalExpense } from './personal-expense.entity';
+import { Bill } from './bill.entity';
+
+@Entity('students')
+export class Student {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ length: 50 })
+  name: string;
+
+  @Column({ length: 20, nullable: true })
+  phone: string;
+
+  @Column({ name: 'id_number', length: 30, nullable: true })
+  idNumber: string;
+
+  @Column({ length: 10, nullable: true })
+  gender: string;
+
+  @Column({ length: 20, nullable: true })
+  ethnicity: string;
+
+  @Column({ name: 'emergency_contact', length: 50, nullable: true })
+  emergencyContact: string;
+
+  @Column({ name: 'emergency_phone', length: 20, nullable: true })
+  emergencyPhone: string;
+
+  @Column({ type: 'varchar', length: 20, default: 'active' })
+  status: string;
+
+  @Column({ length: 100, nullable: true })
+  organization: string;
+
+  @Column({ length: 50, nullable: true })
+  supervisor: string;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+
+  @OneToMany(() => Occupancy, (o) => o.student)
+  occupancies: Occupancy[];
+
+  @OneToMany(() => PersonalExpense, (e) => e.student)
+  personalExpenses: PersonalExpense[];
+
+  @OneToMany(() => Bill, (b) => b.student)
+  bills: Bill[];
+}