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/Company/Item/UnitsController.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace App\Http\Controllers\Company\Item;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\UnitRequest;
+use App\Http\Resources\UnitResource;
+use App\Models\Unit;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+
+class UnitsController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @return Response
+     */
+    public function index(Request $request)
+    {
+        $this->authorize('viewAny', Unit::class);
+
+        $limit = $request->has('limit') ? $request->limit : 5;
+
+        $units = Unit::applyFilters($request->all())
+            ->whereCompany()
+            ->latest()
+            ->paginateData($limit);
+
+        return UnitResource::collection($units);
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param  Request  $request
+     * @return Response
+     */
+    public function store(UnitRequest $request)
+    {
+        $this->authorize('create', Unit::class);
+
+        $unit = Unit::create($request->getUnitPayload());
+
+        return new UnitResource($unit);
+    }
+
+    /**
+     * Display the specified resource.
+     *
+     * @return Response
+     */
+    public function show(Unit $unit)
+    {
+        $this->authorize('view', $unit);
+
+        return new UnitResource($unit);
+    }
+
+    /**
+     * Update the specified resource in storage.
+     *
+     * @param  Request  $request
+     * @return Response
+     */
+    public function update(UnitRequest $request, Unit $unit)
+    {
+        $this->authorize('update', $unit);
+
+        $unit->update($request->getUnitPayload());
+
+        return new UnitResource($unit);
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     *
+     * @return Response
+     */
+    public function destroy(Unit $unit)
+    {
+        $this->authorize('delete', $unit);
+
+        if ($unit->items()->exists()) {
+            return respondJson('items_attached', 'Items Attached');
+        }
+
+        $unit->delete();
+
+        return response()->json([
+            'success' => 'Unit deleted successfully',
+        ]);
+    }
+}