refactor(js): migrate JavaScript files to module directories

Move 47 JS files from static/{admin,vendor,shared}/js/ to their
respective module directories app/modules/*/static/*/js/:

- Orders: orders.js, order-detail.js
- Catalog: products.js (renamed from vendor-products.js), product-*.js
- Inventory: inventory.js (admin & vendor)
- Customers: customers.js, users.js, user-*.js
- Billing: billing-history.js, subscriptions.js, subscription-tiers.js,
  billing.js, invoices.js, feature-store.js, upgrade-prompts.js
- Messaging: messages.js, notifications.js, email-templates.js
- Marketplace: marketplace*.js, letzshop*.js, onboarding.js
- Monitoring: monitoring.js, background-tasks.js, imports.js, logs.js
- Dev Tools: testing-*.js, code-quality-*.js

Update 39 templates to reference new module static paths using
url_for('{module}_static', path='...') pattern.

Files staying in static/ (platform core):
- admin: dashboard, login, platforms, vendors, companies, admin-users,
  settings, components, init-alpine, module-config
- vendor: dashboard, login, profile, settings, team, media, init-alpine
- shared: api-client, utils, money, icons, log-config, vendor-selector,
  media-picker

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/dev_tools/static/admin/js/testing-hub.js

@@ -0,0 +1,125 @@
+// app/modules/dev_tools/static/admin/js/testing-hub.js
+
+// ✅ Use centralized logger - ONE LINE!
+// Create custom logger for testing hub
+const testingLog = window.LogConfig.createLogger('TESTING-HUB');
+
+/**
+ * Testing Hub Alpine.js Component
+ * Central hub for all test suites and QA tools
+ */
+function adminTestingHub() {
+    return {
+        // ✅ CRITICAL: Inherit base layout functionality
+        ...data(),
+
+        // ✅ CRITICAL: Set page identifier
+        currentPage: 'testing',
+
+        // Test suites data
+        testSuites: [
+            {
+                id: 'auth-flow',
+                name: 'Authentication Flow',
+                description: 'Test login, logout, token expiration, redirects, and protected route access.',
+                url: '/admin/test/auth-flow',
+                icon: 'lock-closed',
+                color: 'blue',
+                testCount: 6,
+                features: [
+                    'Login with valid/invalid credentials',
+                    'Token expiration handling',
+                    'Protected route access & redirects',
+                    'localStorage state monitoring'
+                ]
+            },
+            {
+                id: 'vendors-users',
+                name: 'Data Migration & CRUD',
+                description: 'Test vendor and user creation, listing, editing, deletion, and data migration scenarios.',
+                url: '/admin/test/vendors-users-migration',
+                icon: 'database',
+                color: 'orange',
+                testCount: 10,
+                features: [
+                    'Vendor CRUD operations',
+                    'User management & roles',
+                    'Data migration validation',
+                    'Form validation & error handling'
+                ]
+            }
+        ],
+
+        // Stats
+        stats: {
+            totalSuites: 2,
+            totalTests: 16,
+            coverage: 'Auth, CRUD',
+            avgDuration: '< 5 min'
+        },
+
+        // Loading state
+        loading: false,
+
+        // ✅ CRITICAL: Proper initialization with guard
+        async init() {
+            testingLog.info('=== TESTING HUB INITIALIZING ===');
+
+            // Prevent multiple initializations
+            if (window._testingHubInitialized) {
+                testingLog.warn('Testing hub already initialized, skipping...');
+                return;
+            }
+            window._testingHubInitialized = true;
+
+            // Calculate stats
+            this.calculateStats();
+
+            testingLog.info('=== TESTING HUB INITIALIZATION COMPLETE ===');
+        },
+
+        /**
+         * Calculate test statistics
+         */
+        calculateStats() {
+            this.stats.totalSuites = this.testSuites.length;
+            this.stats.totalTests = this.testSuites.reduce((sum, suite) => sum + suite.testCount, 0);
+            testingLog.debug('Stats calculated:', this.stats);
+        },
+
+        /**
+         * Get color classes for test suite cards
+         */
+        getColorClasses(color) {
+            const colorMap = {
+                blue: {
+                    gradient: 'from-blue-500 to-blue-600',
+                    button: 'bg-blue-600 hover:bg-blue-700'
+                },
+                orange: {
+                    gradient: 'from-orange-500 to-orange-600',
+                    button: 'bg-orange-600 hover:bg-orange-700'
+                },
+                green: {
+                    gradient: 'from-green-500 to-green-600',
+                    button: 'bg-green-600 hover:bg-green-700'
+                },
+                purple: {
+                    gradient: 'from-purple-500 to-purple-600',
+                    button: 'bg-purple-600 hover:bg-purple-700'
+                }
+            };
+            return colorMap[color] || colorMap.blue;
+        },
+
+        /**
+         * Navigate to test suite
+         */
+        goToTest(url) {
+            testingLog.info('Navigating to test suite:', url);
+            window.location.href = url;
+        }
+    };
+}
+
+testingLog.info('Testing hub module loaded');