add project file upload to student form, project_files table with backup/restore, download in journal, and crash-proof entries endpoint

public/journal.html

@@ -107,6 +107,13 @@ let totalEntries = 0;
 let searchTimer = null;
 let view = localStorage.getItem('journalView') === 'cards' ? 'cards' : 'list';
 
+function filesHTML(files) {
+  if (!files || !files.length) return '';
+  return `<div class="entry-files">${files.map(f =>
+    `<a href="${API}/api/files/${f.id}" download>${esc(f.name)}</a>`
+  ).join('')}</div>`;
+}
+
 function gridEntryHTML(e) {
   return `
     <div class="card">
@@ -115,6 +122,7 @@ function gridEntryHTML(e) {
         <div class="name">${esc(e.student_name)}</div>
         <div class="group">${esc(e.group_name)}</div>
         <div class="desc">${esc(e.description)}</div>
+        ${filesHTML(e.files)}
         <div class="time">${new Date(e.created_at).toLocaleString('ru')}</div>
       </div>
       <button class="edit" onclick="openEdit(${e.id})" title="Редактировать">✎</button>
@@ -133,6 +141,7 @@ function cardEntryHTML(e) {
         <div class="name">${esc(e.student_name)}</div>
         <div class="group">${esc(e.group_name)}</div>
         <div class="desc">${esc(e.description)}</div>
+        ${filesHTML(e.files)}
       </div>
       <div class="foot">
         <span>${new Date(e.created_at).toLocaleString('ru')}</span>