feat(asset-management): complete module with standardized UI + demo data seeder

- Fix Vendor column bug (name → company_name) across all controllers
- Create 6 missing pages (Assets/Edit, Categories/Create+Edit, Maintenance/Show+Edit, Disposal/Show)
- Standardize all 7 Index pages with DataTable, SearchInput, PerPageSelector, Pagination
- Add AssetManagementDemoSeeder with 5 categories, 22 assets, 8 maintenance, 4 assignments, 3 transfers, 2 disposals
- All 19 controller-referenced pages now have matching .tsx files

app/Http/Controllers/DemoRequestController.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Mail;
+use App\Mail\DemoRequestMail;
+
+class DemoRequestController extends Controller
+{
+    public function store(Request $request)
+    {
+        $validated = $request->validate([
+            'name' => 'required|string|max:255',
+            'email' => 'required|email|max:255',
+            'country' => 'required|string|max:255',
+            'website' => 'nullable|string|max:500',
+            'inquiry_type' => 'required|in:product,service',
+            'project_type' => 'required|in:new,running',
+            'message' => 'nullable|string|max:2000',
+            'phone' => 'required|string|max:30',
+            'preferred_date' => 'required|date',
+            'preferred_time' => 'required|string',
+        ]);
+
+        Mail::to('charles@devappsolutions.ph')
+            ->cc('charles@devappsolutions.ph')
+            ->send(new DemoRequestMail($validated));
+
+        return response()->json([
+            'success' => true,
+            'message' => 'Demo request submitted successfully! We will get back to you shortly.',
+        ]);
+    }
+}