feat(monitoring): add Redis exporter + Sentry docs to deployment guide

- Add redis-exporter container to docker-compose (oliver006/redis_exporter, 32MB)
- Add Redis scrape target to Prometheus config
- Add 4 Redis alert rules: RedisDown, HighMemory, HighConnections, RejectedConnections
- Document Step 19b (Sentry Error Tracking) in Hetzner deployment guide
- Document Step 19c (Redis Monitoring) in Hetzner deployment guide
- Update resource budget and port reference tables

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

docs/frontend/admin/architecture.md

@@ -191,15 +191,15 @@ Component Structure:
       return {
           // ✅ CRITICAL: Inherit base layout state
           ...data(),
-          
+
           // ✅ CRITICAL: Set page identifier
           currentPage: 'dashboard',
-          
+
           // Page-specific state
           loading: false,
           error: null,
           stats: [],
-          
+
           // Initialization
           async init() {
               // Guard against multiple initialization
@@ -208,10 +208,10 @@ Component Structure:
                   return;
               }
               window._dashboardInitialized = true;
-              
+
               await this.loadStats();
           },
-          
+
           // Data loading
           async loadStats() {
               this.loading = true;
@@ -294,22 +294,22 @@ init-alpine.js provides:
           // Theme state
           dark: localStorage.getItem('theme') === 'dark',
           toggleTheme() { /* ... */ },
-          
+
           // Side menu state
           isSideMenuOpen: false,
           toggleSideMenu() { /* ... */ },
           closeSideMenu() { /* ... */ },
-          
+
           // Profile menu state
           isProfileMenuOpen: false,
           toggleProfileMenu() { /* ... */ },
           closeProfileMenu() { /* ... */ },
-          
+
           // Notifications menu state
           isNotificationsMenuOpen: false,
           toggleNotificationsMenu() { /* ... */ },
           closeNotificationsMenu() { /* ... */ },
-          
+
           // Page identifier (override in each page)
           currentPage: ''
       };
@@ -320,7 +320,7 @@ Your page inherits ALL of this:
       return {
           ...data(),  // ← Spreads all base functionality
           currentPage: 'stores',  // ← Override page identifier
-          
+
           // Your page-specific state
           stores: [],
           loading: false
@@ -446,10 +446,10 @@ Pattern:
           dashLog.warn('Already initialized, skipping...');
           return;  // Exit early
       }
-      
+
       // Set flag BEFORE async operations
       window._dashboardInitialized = true;
-      
+
       // Safe to proceed
       await this.loadData();
   }
@@ -485,7 +485,7 @@ Pre-configured Loggers:
 Usage:
   // Use pre-configured logger
   const dashLog = window.LogConfig.loggers.dashboard;
-  
+
   dashLog.info('Dashboard loading...');
   dashLog.error('Failed to load stats', error);
   dashLog.debug('Stats data:', statsData);
@@ -497,13 +497,13 @@ Advanced Features:
   dashLog.info('Fetching stats...');
   dashLog.info('Fetching activity...');
   dashLog.groupEnd();
-  
+
   // API call logging
   window.LogConfig.logApiCall('GET', url, data, 'response');
-  
+
   // Performance logging
   window.LogConfig.logPerformance('Load Stats', duration);
-  
+
   // Error logging
   window.LogConfig.logError(error, 'Load Stats');
 
@@ -527,16 +527,16 @@ CRITICAL: Always use lowercase 'apiClient'
 
 Usage:
   const data = await apiClient.get('/api/v1/admin/stores');
-  
+
   await apiClient.post('/api/v1/admin/stores', {
       name: 'New Store',
       code: 'NEWSTORE'
   });
-  
+
   await apiClient.put('/api/v1/admin/stores/123', {
       name: 'Updated Name'
   });
-  
+
   await apiClient.delete('/api/v1/admin/stores/123');
 
 Features: