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/students/dto/student.dto.ts

@@ -110,4 +110,14 @@ export class QueryStudentDto {
   @Type(() => Number)
   @IsInt()
   organizationId?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  classId?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  teacherId?: number;
 }