Add configuration revisions system and project variant deletion

Features:
- Configuration versioning: immutable snapshots in local_configuration_versions
- Revisions UI: /configs/:uuid/revisions page to view version history
- Clone from version: ability to clone configuration from specific revision
- Project variant deletion: DELETE /api/projects/:uuid endpoint
- Updated CLAUDE.md with new architecture details and endpoints

Architecture updates:
- local_configuration_versions table for immutable snapshots
- Version tracking on each configuration save
- Rollback capability to previous versions
- Variant deletion with main variant protection

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

web/templates/index.html

@@ -20,7 +20,9 @@
                     <span id="breadcrumb-project-variant">main</span>
                 </a>
                 <span class="text-gray-400">-</span>
-                <span id="breadcrumb-config-name">Конфигуратор</span>
+                <a id="breadcrumb-config-name-link" href="#" class="text-blue-700 hover:underline">
+                    <span id="breadcrumb-config-name">Конфигуратор</span>
+                </a>
                 <span class="text-gray-400">-</span>
                 <span id="breadcrumb-config-version">v1</span>
             </div>
@@ -338,6 +340,7 @@ let ASSIGNED_CATEGORIES = Object.values(TAB_CONFIG)
 // State
 let configUUID = '{{.ConfigUUID}}';
 let configName = '';
+let currentVersionNo = 1;
 let projectUUID = '';
 let projectName = '';
 let projectCode = '';
@@ -399,7 +402,11 @@ function updateConfigBreadcrumbs() {
     codeEl.textContent = code;
     variantEl.textContent = variant;
     configEl.textContent = configName || 'Конфигурация';
-    versionEl.textContent = 'v1';
+    versionEl.textContent = 'v' + (currentVersionNo || 1);
+    const configNameLinkEl = document.getElementById('breadcrumb-config-name-link');
+    if (configNameLinkEl && configUUID) {
+        configNameLinkEl.href = '/configs/' + configUUID + '/revisions';
+    }
 }
 let currentTab = 'base';
 let allComponents = [];
@@ -688,6 +695,7 @@ document.addEventListener('DOMContentLoaded', async function() {
 
         const config = await resp.json();
         configName = config.name;
+        currentVersionNo = config.current_version_no || 1;
         projectUUID = config.project_uuid || '';
         await loadProjectIndex();
         updateConfigBreadcrumbs();
@@ -1937,6 +1945,13 @@ async function saveConfig(showNotification = true) {
             return;
         }
 
+        const saved = await resp.json();
+        if (saved && saved.current_version_no) {
+            currentVersionNo = saved.current_version_no;
+            const versionEl = document.getElementById('breadcrumb-config-version');
+            if (versionEl) versionEl.textContent = 'v' + currentVersionNo;
+        }
+
         if (showNotification) {
             showToast('Сохранено', 'success');
         }