feat: 增加学生信息管理功能，优化操行分历史记录展示并更新使用文档

frontend/admin/homework.php

@@ -65,6 +65,14 @@ include __DIR__ . '/../includes/header.php';
                 <label>已选学生</label>
                 <div id="selectedStudentsCount" class="selected-info">未选择学生</div>
             </div>
+            <?php if ($role === '学习委员'): ?>
+            <div class="form-group">
+                <label>科目</label>
+                <select id="hwSubjectSelect">
+                    <option value="">不选择科目</option>
+                </select>
+            </div>
+            <?php endif; ?>
             <div class="form-group">
                 <label>扣分类型</label>
                 <div class="deduction-types">
@@ -92,6 +100,7 @@ include __DIR__ . '/../includes/header.php';
 
 <script>
 var selectedStudentIds = [];
+const hwRole = '<?php echo $role; ?>';
 
 // 初始化扣分配置
 const hwMaxPoints = window.HOMEWORK_MAX_POINTS || 3;
@@ -107,6 +116,21 @@ document.querySelectorAll('.hw-max').forEach(el => el.textContent = hwMaxPoints)
 document.getElementById('pointsChange').setAttribute('min', -hwMaxPoints);
 document.getElementById('pointsChange').setAttribute('max', hwMaxPoints);
 
+// 加载科目列表（学习委员）
+async function loadSubjectsForHomework() {
+    if (hwRole !== '学习委员') return;
+    const subjectSelect = document.getElementById('hwSubjectSelect');
+    if (!subjectSelect) return;
+    const res = await apiGet('/api/subject/list');
+    if (res && res.success && res.data && res.data.subjects) {
+        let html = '<option value="">不选择科目</option>';
+        res.data.subjects.forEach(s => {
+            html += `<option value="${escapeHtml(s.subject_name)}">${escapeHtml(s.subject_name)}</option>`;
+        });
+        subjectSelect.innerHTML = html;
+    }
+}
+
 async function loadStudents() {
     const res = await apiGet('/api/admin/students', {page_size: 1000});
     if (res && res.success) {
@@ -169,10 +193,22 @@ function handleSubmitPoints() {
         showToast(`每次加减分不超过${hwMaxPoints}分`, 'warning');
         return;
     }
+    
+    // 学习委员附加科目前缀
+    if (hwRole === '学习委员') {
+        const subjectSelect = document.getElementById('hwSubjectSelect');
+        const subjectName = subjectSelect ? subjectSelect.value : '';
+        const reasonEl = document.getElementById('pointsReason');
+        if (subjectName && !reasonEl.value.startsWith('[')) {
+            reasonEl.value = `[${subjectName}] ${reasonEl.value}`;
+        }
+    }
+    
     submitBatchPoints();
 }
 
 loadStudents();
+loadSubjectsForHomework();
 </script>
 <script src="/assets/js/admin.js"></script>