fix permissions and teacher attendance workflows

apps/server/src/database/database-migrations.module.ts

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+import { Module } from '@nestjs/common';
+import { DatabaseMigrationsService } from './database-migrations.service';
+
+@Module({ providers: [DatabaseMigrationsService] })
+export class DatabaseMigrationsModule {}

apps/server/src/database/database-migrations.service.ts

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+import { Injectable, Logger, OnApplicationBootstrap } from '@nestjs/common';
+import { DataSource } from 'typeorm';
+
+@Injectable()
+export class DatabaseMigrationsService implements OnApplicationBootstrap {
+  private readonly logger = new Logger(DatabaseMigrationsService.name);
+
+  constructor(private readonly dataSource: DataSource) {}
+
+  async onApplicationBootstrap(): Promise<void> {
+    await this.normalizeClassDates();
+  }
+
+  private async normalizeClassDates(): Promise<void> {
+    const driver = this.dataSource.options.type;
+    const dateExpression = (column: string) =>
+      driver === 'mysql' ? `DATE(${column})` : `substr(${column}, 1, 10)`;
+
+    const lengthFunction = driver === 'mysql' ? 'CHAR_LENGTH' : 'length';
+    const result = await this.dataSource.transaction((manager) =>
+      manager.query(`
+        UPDATE classes
+        SET
+          start_date = CASE
+            WHEN start_date IS NULL OR start_date = '' THEN start_date
+            ELSE ${dateExpression('start_date')}
+          END,
+          end_date = CASE
+            WHEN end_date IS NULL OR end_date = '' THEN end_date
+            ELSE ${dateExpression('end_date')}
+          END
+        WHERE
+          (start_date IS NOT NULL AND ${lengthFunction}(start_date) > 10)
+          OR (end_date IS NOT NULL AND ${lengthFunction}(end_date) > 10)
+      `),
+    );
+
+    const affected = typeof result?.changes === 'number' ? result.changes : result?.affectedRows;
+    if (affected) this.logger.log(`已规范化 ${affected} 条班级日期数据`);
+  }
+}

apps/server/src/database/date-normalization.spec.ts

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+import { normalizeDateOnly } from './date-normalization';
+
+describe('normalizeDateOnly', () => {
+  it('keeps date-only values unchanged', () => {
+    expect(normalizeDateOnly('2026-07-02')).toBe('2026-07-02');
+  });
+
+  it('converts legacy ISO timestamps to their UTC calendar date', () => {
+    expect(normalizeDateOnly('2026-07-01T16:00:00.000Z')).toBe('2026-07-01');
+  });
+
+  it('rejects unsupported date formats', () => {
+    expect(() => normalizeDateOnly('07/01/2026')).toThrow('无效日期格式');
+  });
+});

apps/server/src/database/date-normalization.ts

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+const DATE_ONLY_PATTERN = /^\d{4}-\d{2}-\d{2}$/;
+const ISO_DATE_PREFIX_PATTERN = /^(\d{4}-\d{2}-\d{2})T/;
+
+export function normalizeDateOnly(value?: string | null): string | null | undefined {
+  if (value == null || value === '') return value;
+  if (DATE_ONLY_PATTERN.test(value)) return value;
+
+  const isoPrefix = ISO_DATE_PREFIX_PATTERN.exec(value)?.[1];
+  if (isoPrefix) {
+    const date = new Date(value);
+    if (!Number.isNaN(date.getTime())) return date.toISOString().slice(0, 10);
+  }
+
+  throw new Error(`无效日期格式: ${value}`);
+}