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

app/Providers/Filament/CentralPanelProvider.php

@@ -10,11 +10,13 @@ use Filament\Pages\Dashboard;
 use Filament\Panel;
 use Filament\PanelProvider;
 use Filament\Support\Colors\Color;
+use Filament\View\PanelsRenderHook;
 use Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse;
 use Illuminate\Cookie\Middleware\EncryptCookies;
 use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken;
 use Illuminate\Routing\Middleware\SubstituteBindings;
 use Illuminate\Session\Middleware\StartSession;
+use Illuminate\Support\Facades\Blade;
 use Illuminate\View\Middleware\ShareErrorsFromSession;
 
 /**
@@ -50,7 +52,28 @@ class CentralPanelProvider extends PanelProvider
             ->discoverWidgets(in: app_path('Filament/Central/Widgets'), for: 'App\\Filament\\Central\\Widgets')
             ->widgets([
                 \App\Filament\Central\Widgets\PlatformStats::class,
+                \App\Filament\Central\Widgets\RevenueChart::class,
+                \App\Filament\Central\Widgets\PendingPayments::class,
+                \App\Filament\Central\Widgets\RecentTenants::class,
             ])
+            ->databaseNotifications()
+            ->databaseNotificationsPolling('60s')
+            ->globalSearchKeyBindings(['command+k', 'ctrl+k'])
+            ->navigationGroups([
+                'Tenants',
+                'Acces',
+            ])
+            ->renderHook(
+                PanelsRenderHook::HEAD_END,
+                fn (): string => Blade::render(<<<'BLADE'
+                    <link rel="manifest" href="/admin-manifest.json">
+                    <meta name="theme-color" content="#6366f1">
+                    <meta name="apple-mobile-web-app-capable" content="yes">
+                    <meta name="apple-mobile-web-app-status-bar-style" content="default">
+                    <meta name="apple-mobile-web-app-title" content="AutoCRM Admin">
+                    <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><rect width='100' height='100' rx='20' fill='%236366f1'/><text x='50' y='66' font-size='52' text-anchor='middle' fill='%23fff' font-family='sans-serif' font-weight='bold'>A</text></svg>">
+                BLADE)
+            )
             ->middleware([
                 EncryptCookies::class,
                 AddQueuedCookiesToResponse::class,