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/migrations/2026_05_08_000030_create_subscriptions_table.php

@@ -0,0 +1,44 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('subscriptions', function (Blueprint $t) {
+            $t->id();
+            $t->foreignId('company_id')->constrained()->cascadeOnDelete();
+            $t->foreignId('plan_id')->nullable()->constrained()->nullOnDelete();
+
+            $t->enum('period', ['monthly', 'yearly'])->default('monthly');
+            $t->decimal('amount', 10, 2);
+            $t->string('currency', 3)->default('MDL');
+
+            $t->enum('status', ['pending', 'paid', 'overdue', 'cancelled', 'refunded'])
+                ->default('pending');
+
+            $t->date('period_start');
+            $t->date('period_end');
+            $t->timestamp('paid_at')->nullable();
+            $t->timestamp('due_at')->nullable();
+
+            $t->string('invoice_number', 30)->nullable();
+            $t->string('payment_method', 30)->nullable(); // card, bank_transfer, cash
+            $t->string('reference', 100)->nullable();      // Stripe id, transfer ref
+            $t->text('notes')->nullable();
+
+            $t->timestamps();
+
+            $t->index(['company_id', 'status']);
+            $t->index('due_at');
+            $t->index('paid_at');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('subscriptions');
+    }
+};

database/migrations/2026_05_08_000040_add_role_to_super_admins.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::table('super_admins', function (Blueprint $t) {
+            $t->enum('role', ['owner', 'admin', 'support', 'sales', 'finance'])
+                ->default('support')->after('is_active');
+            $t->string('phone', 40)->nullable()->after('email');
+            $t->text('notes')->nullable()->after('phone');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('super_admins', function (Blueprint $t) {
+            $t->dropColumn(['role', 'phone', 'notes']);
+        });
+    }
+};