Rename controller namespaces: drop V1 prefix, clarify roles

V1/Admin     -> Company       (company-scoped controllers)
V1/SuperAdmin -> Admin        (platform-wide admin controllers)
V1/Customer  -> CustomerPortal (customer-facing portal)
V1/Installation -> Setup      (installation wizard)
V1/PDF       -> Pdf           (consistent casing)
V1/Modules   -> Modules       (drop V1 prefix)
V1/Webhook   -> Webhook       (drop V1 prefix)

The V1 prefix served no purpose - API versioning is in the route prefix
(/api/v1/), not the controller namespace. "Admin" was misleading for
company-scoped controllers. "SuperAdmin" is now simply "Admin" for
platform administration.

app/Http/Controllers/CustomerPortal/Invoice/InvoicesController.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Http\Controllers\CustomerPortal\Invoice;
+
+use App\Http\Controllers\Controller;
+use App\Http\Resources\Customer\InvoiceResource;
+use App\Models\Company;
+use App\Models\Invoice;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Illuminate\Support\Facades\Auth;
+
+class InvoicesController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @return Response
+     */
+    public function index(Request $request)
+    {
+        $limit = $request->has('limit') ? $request->limit : 10;
+
+        $invoices = Invoice::with(['items', 'customer', 'creator', 'taxes'])
+            ->where('status', '<>', 'DRAFT')
+            ->applyFilters($request->all())
+            ->whereCustomer(Auth::guard('customer')->id())
+            ->latest()
+            ->paginateData($limit);
+
+        return InvoiceResource::collection($invoices)
+            ->additional(['meta' => [
+                'invoiceTotalCount' => Invoice::where('status', '<>', 'DRAFT')->whereCustomer(Auth::guard('customer')->id())->count(),
+            ]]);
+    }
+
+    public function show(Company $company, $id)
+    {
+        $invoice = $company->invoices()
+            ->whereCustomer(Auth::guard('customer')->id())
+            ->where('id', $id)
+            ->first();
+
+        if (! $invoice) {
+            return response()->json(['error' => 'invoice_not_found'], 404);
+        }
+
+        return new InvoiceResource($invoice);
+    }
+}