Add smart self-healing for sync errors

Implements automatic repair mechanism for pending changes with sync errors:
- Projects: validates and fixes empty name/code fields
- Configurations: ensures project references exist or assigns system project
- Clears errors and resets attempts to give changes another sync chance

Backend:
- LocalDB.RepairPendingChanges() with smart validation logic
- POST /api/sync/repair endpoint
- Detailed repair results with remaining errors

Frontend:
- Auto-repair section in sync modal shown when errors exist
- "ИСПРАВИТЬ" button with clear explanation of actions
- Real-time feedback with result messages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/templates/base.html

@@ -123,6 +123,26 @@
                         <h4 class="font-medium text-gray-900 mb-2">Ошибки синхронизации</h4>
                         <div id="modal-errors-list" class="text-sm max-h-40 overflow-y-auto space-y-1"></div>
                     </div>
+
+                    <!-- Section 5: Self-Healing (shown only if errors exist) -->
+                    <div id="modal-repair-section" class="hidden">
+                        <div class="bg-blue-50 border border-blue-200 rounded-lg p-4">
+                            <h4 class="font-medium text-blue-900 mb-2">Автоматическое исправление</h4>
+                            <p class="text-sm text-blue-700 mb-3">
+                                Система может исправить данные и очистить ошибки синхронизации:
+                            </p>
+                            <ul class="text-sm text-blue-700 mb-3 ml-4 list-disc space-y-1">
+                                <li>Проверит и исправит названия проектов</li>
+                                <li>Восстановит битые ссылки на проекты</li>
+                                <li>Очистит ошибки и даст pending changes еще шанс</li>
+                            </ul>
+                            <button id="repair-button" onclick="repairPendingChanges()"
+                                class="w-full px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed">
+                                ИСПРАВИТЬ
+                            </button>
+                            <div id="repair-result" class="mt-2 text-sm hidden"></div>
+                        </div>
+                    </div>
                 </div>
 
                 <div class="mt-6 flex justify-end">
@@ -235,7 +255,8 @@
                 // Section 4: Errors
                 const errorsSection = document.getElementById('modal-errors-section');
                 const errorsList = document.getElementById('modal-errors-list');
-                if (data.errors && data.errors.length > 0) {
+                const hasErrors = data.errors && data.errors.length > 0;
+                if (hasErrors) {
                     errorsSection.classList.remove('hidden');
                     errorsList.innerHTML = data.errors.map(error => {
                         const time = new Date(error.timestamp).toLocaleString('ru-RU');
@@ -246,12 +267,65 @@
                 } else {
                     errorsSection.classList.add('hidden');
                 }
+
+                // Section 5: Repair (show only if errors exist)
+                const repairSection = document.getElementById('modal-repair-section');
+                const repairResult = document.getElementById('repair-result');
+                if (hasErrors) {
+                    repairSection.classList.remove('hidden');
+                    repairResult.classList.add('hidden');
+                    repairResult.innerHTML = '';
+                } else {
+                    repairSection.classList.add('hidden');
+                }
             } catch(e) {
                 console.error('Failed to load sync info:', e);
                 document.getElementById('modal-db-status').textContent = 'Ошибка загрузки';
             }
         }
 
+        // Repair pending changes
+        async function repairPendingChanges() {
+            const button = document.getElementById('repair-button');
+            const resultDiv = document.getElementById('repair-result');
+
+            button.disabled = true;
+            button.textContent = 'Исправление...';
+            resultDiv.classList.add('hidden');
+
+            try {
+                const resp = await fetch('/api/sync/repair', { method: 'POST' });
+                const data = await resp.json();
+
+                if (data.success) {
+                    resultDiv.classList.remove('hidden');
+                    if (data.repaired > 0) {
+                        resultDiv.className = 'mt-2 text-sm text-green-700 bg-green-50 rounded px-3 py-2';
+                        resultDiv.textContent = `✓ Исправлено: ${data.repaired}`;
+                        // Reload sync info after repair
+                        setTimeout(() => loadSyncInfo(), 1000);
+                    } else {
+                        resultDiv.className = 'mt-2 text-sm text-yellow-700 bg-yellow-50 rounded px-3 py-2';
+                        resultDiv.textContent = 'Нечего исправлять или проблемы остались';
+                        if (data.remaining_errors && data.remaining_errors.length > 0) {
+                            resultDiv.innerHTML += '<div class="mt-1 text-xs">' + data.remaining_errors.join('<br>') + '</div>';
+                        }
+                    }
+                } else {
+                    resultDiv.classList.remove('hidden');
+                    resultDiv.className = 'mt-2 text-sm text-red-700 bg-red-50 rounded px-3 py-2';
+                    resultDiv.textContent = 'Ошибка: ' + (data.error || 'неизвестная ошибка');
+                }
+            } catch (e) {
+                resultDiv.classList.remove('hidden');
+                resultDiv.className = 'mt-2 text-sm text-red-700 bg-red-50 rounded px-3 py-2';
+                resultDiv.textContent = 'Ошибка запроса: ' + e.message;
+            } finally {
+                button.disabled = false;
+                button.textContent = 'ИСПРАВИТЬ';
+            }
+        }
+
         // Event delegation for sync dropdown and actions
         document.addEventListener('DOMContentLoaded', function() {
             loadDBUser();