feat: refine admin forms, attendance and finance workflows

Squash merge PR #23.

Included changes:
- complete occupancy check-in required fields/default payload
- improve responsive admin management pages
- fix attendance edge cases and attendance period config
- refine wallet/finance-related workflow handling

Checks:
- npm run typecheck -w apps/admin
- npm run typecheck -w apps/server

apps/server/src/entities/attendance-period-config.entity.ts

@@ -0,0 +1,33 @@
+import { Column, CreateDateColumn, Entity, Index, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+
+@Entity('attendance_period_configs')
+@Index(['periodKey'], { unique: true })
+@Index(['sortOrder'])
+export class AttendancePeriodConfig {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ name: 'period_key', type: 'varchar', length: 40 })
+  periodKey: string;
+
+  @Column({ type: 'varchar', length: 40 })
+  label: string;
+
+  @Column({ name: 'start_time', type: 'varchar', length: 5 })
+  startTime: string;
+
+  @Column({ name: 'end_time', type: 'varchar', length: 5 })
+  endTime: string;
+
+  @Column({ name: 'sort_order', type: 'integer', default: 0 })
+  sortOrder: number;
+
+  @Column({ type: 'boolean', default: true })
+  enabled: boolean;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}