Central panel SaaS upgrade — Plans/Subscriptions/SuperAdmins/Detail page

Models & migrations:
- subscriptions table (company, plan, period, amount, status, dates, invoice)
- super_admins: role enum (owner/admin/support/sales/finance) + phone + notes
- Subscription model with STATUSES/PERIODS/PAYMENT_METHODS + invoice number
  generator + extends company.active_until on mark_paid
- Company model: subscriptions() + latestSubscription() relations
- SuperAdmin model: role helpers (isOwner, canManageBilling, canManageTenants)

Filament Central panel:
- PlanResource (CRUD, features checklist, limits per plan, abonati count badge)
- SubscriptionResource (CRUD, mark_paid action, navigation badge for overdue)
- SuperAdminResource (CRUD, reset password, toggle 2FA, can't self-delete)
- ViewCompany page with live stats (users/clients/vehicles/WO/parts/revenue/
  storage/last_login + days_until_expiry), subscriptions history table,
  config snapshot, action buttons (open/issue invoice/upload logo/suspend)
- CompanyResource: row click → view, openUrlInNewTab action, recordTitleAttribute,
  empty state, view route registered
- PlatformStats widget upgraded: 6 cards (incl. MRR realized this month, overdue
  invoices count, click-through to filtered tables)
- RevenueChart: 12-month MRR line chart
- RecentTenants: latest 8 tenants with click-through
- PendingPayments: pending+overdue invoices table
- Database notifications enabled + Cmd+K global search
- HEAD_END render hook: PWA manifest + theme color + emoji favicon
- /admin-manifest.json route

Seeder:
- Plans aligned with new FEATURE_OPTIONS (kanban/pdf/reports/ai/api/reverb/etc)
- 4 plans: Free / Basic / Pro / Enterprise (with proper limits)
- SuperAdmin gets role='owner'
- Demo subscription for psauto on Pro plan, marked paid this month

database/seeders/DatabaseSeeder.php

@@ -39,25 +39,41 @@ class DatabaseSeeder extends Seeder
         $free = Plan::firstOrCreate(['slug' => 'free'], [
             'name' => 'Free',
             'price_monthly' => 0,
+            'price_yearly' => 0,
             'currency' => 'MDL',
-            'features' => ['core'],
-            'limits' => ['max_users' => 2, 'max_vehicles' => 50],
+            'features' => ['kanban'],
+            'limits' => ['max_users' => 2, 'max_vehicles' => 50, 'max_clients' => 100, 'storage_mb' => 100],
+            'is_active' => true, 'is_public' => true,
         ]);
 
         Plan::firstOrCreate(['slug' => 'basic'], [
             'name' => 'Basic',
             'price_monthly' => 299,
+            'price_yearly' => 2990,
             'currency' => 'MDL',
-            'features' => ['core', 'workorders', 'kanban'],
-            'limits' => ['max_users' => 5, 'max_vehicles' => 500],
+            'features' => ['kanban', 'pdf', 'reports'],
+            'limits' => ['max_users' => 5, 'max_vehicles' => 500, 'max_clients' => 1000, 'storage_mb' => 1000],
+            'is_active' => true, 'is_public' => true,
         ]);
 
         Plan::firstOrCreate(['slug' => 'pro'], [
             'name' => 'Pro',
             'price_monthly' => 599,
+            'price_yearly' => 5990,
             'currency' => 'MDL',
-            'features' => ['core', 'workorders', 'kanban', 'reports', 'ai', 'api'],
-            'limits' => ['max_users' => -1, 'max_vehicles' => -1],
+            'features' => ['kanban', 'pdf', 'reports', 'ai', 'api', 'reverb', 'multi_user', 'white_label'],
+            'limits' => ['max_users' => 20, 'max_vehicles' => 5000, 'max_clients' => 10000, 'storage_mb' => 10000, 'ai_messages_month' => 1000],
+            'is_active' => true, 'is_public' => true,
+        ]);
+
+        Plan::firstOrCreate(['slug' => 'enterprise'], [
+            'name' => 'Enterprise',
+            'price_monthly' => 1499,
+            'price_yearly' => 14990,
+            'currency' => 'MDL',
+            'features' => ['kanban', 'pdf', 'reports', 'ai', 'api', 'reverb', 'multi_user', 'white_label', 'priority_support', 'custom_domain'],
+            'limits' => [],
+            'is_active' => true, 'is_public' => true,
         ]);
 
         // ─── Super-admin (operator platformă) ─────────────────────
@@ -65,8 +81,29 @@ class DatabaseSeeder extends Seeder
             'name' => 'Vasyka',
             'password' => Hash::make('admin123'),
             'is_active' => true,
+            'role' => 'owner',
         ]);
 
+        // ─── Subscription demo (PSauto pe Pro plan, plătit) ──────
+        $proPlan = Plan::where('slug', 'pro')->first();
+        $psautoCompany = Company::where('slug', 'psauto')->first();
+        if ($proPlan && $psautoCompany) {
+            \App\Models\Central\Subscription::firstOrCreate(
+                ['company_id' => $psautoCompany->id, 'period_start' => today()->startOfMonth()],
+                [
+                    'plan_id' => $proPlan->id,
+                    'period' => 'monthly',
+                    'amount' => $proPlan->price_monthly,
+                    'currency' => 'MDL',
+                    'status' => 'paid',
+                    'period_end' => today()->endOfMonth(),
+                    'paid_at' => today()->startOfMonth()->addDay(),
+                    'invoice_number' => 'INV-' . date('Ym') . '-0001',
+                    'payment_method' => 'bank_transfer',
+                ]
+            );
+        }
+
         // ─── PSauto demo company ──────────────────────────────────
         $psauto = Company::firstOrCreate(['slug' => 'psauto'], [
             'name' => 'PSauto SRL',