fix(admin): 修正接口 schema 与路由不匹配

- classroomSchema 允许 building/status 为 null，教室查看页恢复数据
- 排期 matrix 单元格为对象而非数组，教室排期页恢复渲染
- 押金批量收取改用 /deposits/eligible-students 路由
- 学生下拉 schema 按 /deposits/student-lookups 实际结构校验
- 水电费录入改走 /expenses/student-utility，批量恢复改为 PUT

apps/admin/src/api/schemas/dashboard.ts

@@ -4,7 +4,8 @@ export const classroomScheduleSchema = z
   .object({
     classrooms: z.array(z.record(z.string(), z.unknown())),
     organizations: z.array(z.record(z.string(), z.unknown())),
-    matrix: z.record(z.string(), z.record(z.string(), z.array(z.record(z.string(), z.unknown())))),
+    // matrix: 教室 id → 日期 → 单条排课/租赁记录（对象，非数组）
+    matrix: z.record(z.string(), z.record(z.string(), z.record(z.string(), z.unknown()))),
     summary: z.record(z.string(), z.record(z.string(), z.unknown())),
     days: z.number().optional(),
   })