feat(modules): module topics for student form, admin CRUD with pagination

- db: modules table (name, lessons_count) + entries.module_id (ON DELETE SET NULL), migration + idempotent startup ensure
- api: GET /api/modules (public, search + limit/offset, entries_count), POST/PUT/DELETE (admin, audit-logged)
- entries: accept/validate module_id on create/update, return module_name, module_id filter
- backup/restore: include modules and entries.module_id
- student form: required module select, hidden while no modules exist
- admin: modules.html + js/modules.js list with pagination, search, create/edit/delete modal
- journal: module filter, module select in edit modal, module badge, CSV column

public/js/journal.js

@@ -4,6 +4,8 @@ let highlightNewIds = new Set();
 let highlightClearTimer = null;
 let editId = null;
 let editGroups = [];
+let editModules = [];
+let modulesLoaded = false;
 let groupsLoaded = false;
 let studentsLoaded = false;
 const PAGE_SIZE = 20;
@@ -99,7 +101,7 @@ function gridEntryHTML(e) {
       ${mp ? `<img src="${thumbSrc(mp)}" data-img="${API}${mp}" loading="lazy" decoding="async" alt="">` : ''}
         <div class="info">
         <div class="name">${esc(e.student_name)}</div>
-        <div class="group">${esc(e.group_name)}</div>
+        <div class="group">${esc(e.group_name)}${e.module_name ? ' · ' + esc(e.module_name) : ''}</div>
         <div class="desc">${esc(e.description)}${aiBadge(e)}</div>
         ${filesHTML(e.files)}
         <div class="time">${new Date(e.created_at).toLocaleString('ru')}</div>
@@ -119,6 +121,7 @@ function cardEntryHTML(e) {
         ? `<img src="${thumbSrc(mp)}" data-img="${API}${mp}" loading="lazy" decoding="async" alt="">`
         : `<div class="no-photo"><svg viewBox="0 0 240 160" preserveAspectRatio="xMidYMid meet" aria-hidden="true"><circle cx="105" cy="48" r="15"/><path d="M74 140 C74 106 88 92 105 92 C122 92 136 106 136 140 Z"/><circle cx="145" cy="58" r="18"/><path d="M108 144 C108 104 124 88 145 88 C166 88 182 104 182 144 Z"/></svg></div>`}
       ${e.group_name ? `<span class="group-badge" title="${esc(e.group_name)}">${esc(e.group_name)}</span>` : ''}
+      ${e.module_name ? `<span class="group-badge" style="left:auto;right:8px;background:rgba(37,99,235,.8)" title="Модуль: ${esc(e.module_name)}">${esc(e.module_name)}</span>` : ''}
       <div class="body">
         <div class="name">${esc(e.student_name)}</div>
         <div class="desc">${esc(e.description)}${aiBadge(e)}</div>
@@ -216,6 +219,31 @@ async function loadGroupOptions() {
   groupsLoaded = true;
 }
 
+async function loadModuleOptions() {
+  const res = await fetch(`${API}/api/modules`);
+  if (!res.ok) return;
+  const data = await res.json();
+  editModules = data.modules || [];
+  modulesLoaded = true;
+  const filt = document.getElementById('moduleFilter');
+  if (filt) {
+    while (filt.options.length > 1) filt.remove(1);
+    editModules.forEach(m => {
+      const o = document.createElement('option');
+      o.value = m.id; o.textContent = m.name;
+      filt.appendChild(o);
+    });
+  }
+}
+
+function fillEditModuleSelect(selected) {
+  const sel = document.getElementById('editModule');
+  if (!sel) return;
+  sel.innerHTML = '<option value="">— не выбрано —</option>' +
+    editModules.map(m => `<option value="${m.id}">${esc(m.name)}</option>`).join('');
+  sel.value = selected ? String(selected) : '';
+}
+
 async function loadStudentOptions() {
   if (studentsLoaded) return;
   const dl = document.getElementById('studentFilterList');
@@ -237,6 +265,8 @@ async function loadEntries() {
   if (gid) p.set('group_id', gid);
   if (df) p.set('date_from', df);
   if (dt) p.set('date_to', dt);
+  const mid = document.getElementById('moduleFilter') ? document.getElementById('moduleFilter').value : '';
+  if (mid) p.set('module_id', mid);
   p.set('limit', PAGE_SIZE);
   p.set('offset', (page - 1) * PAGE_SIZE);
   const res = await fetch(`${API}/api/entries?${p}`, { headers: hdr() });
@@ -337,6 +367,8 @@ async function openEdit(id) {
     sel.innerHTML = editGroups.map(g => `<option value="${g.id}">${esc(g.name)}</option>`).join('');
   }
   sel.value = e.group_id;
+  if (!modulesLoaded) await loadModuleOptions();
+  fillEditModuleSelect(e.module_id);
   renderEditPhotos(e.photos || [], e.photo_path);
   document.getElementById('editModal').classList.add('open');
 }
@@ -1130,6 +1162,7 @@ async function saveEdit() {
   formData.append('student_name', name);
   formData.append('group_id', group_id);
   formData.append('description', description);
+  formData.append('module_id', document.getElementById('editModule').value);
 
   const photoFiles = document.getElementById('editPhoto').files;
   for (const f of photoFiles) formData.append('photo', f);
@@ -1173,6 +1206,7 @@ async function delEntry(id) {
 
 document.getElementById('studentFilter').addEventListener('change', () => { page = 1; loadEntries(); });
 document.getElementById('groupFilter').addEventListener('change', () => { page = 1; loadEntries(); });
+document.getElementById('moduleFilter').addEventListener('change', () => { page = 1; loadEntries(); });
 document.getElementById('dateFrom').addEventListener('change', () => { page = 1; loadEntries(); });
 document.getElementById('dateTo').addEventListener('change', () => { page = 1; loadEntries(); });
 document.getElementById('searchInput').addEventListener('input', () => {
@@ -1227,14 +1261,17 @@ async function exportCSV() {
   if (gid) p.set('group_id', gid);
   if (df) p.set('date_from', df);
   if (dt) p.set('date_to', dt);
+  const mid = document.getElementById('moduleFilter') ? document.getElementById('moduleFilter').value : '';
+  if (mid) p.set('module_id', mid);
   const res = await fetch(`${API}/api/entries?${p}`, { headers: hdr() });
   const entries = (await res.json()).entries;
   if (!entries.length) { alert('Нет данных для экспорта'); return; }
-  const rows = [['Фамилия и имя', 'Группа', 'Описание', 'Дата', 'Фото']];
+  const rows = [['Фамилия и имя', 'Группа', 'Тема модуля', 'Описание', 'Дата', 'Фото']];
   entries.forEach(e => {
     rows.push([
       e.student_name,
       e.group_name,
+      e.module_name || '',
       e.description.replace(/\n/g, ' '),
       new Date(e.created_at).toLocaleString('ru'),
       e.photo_path ? `${API}${e.photo_path}` : ''
@@ -1440,6 +1477,7 @@ document.getElementById('linkCopyBtn').addEventListener('click', copyLink);
     });
     setDefaultDates();
     loadGroupOptions();
+    loadModuleOptions();
     loadStudentOptions();
     loadEntries();
     connectLiveUpdates();