add all controllers logic

app/Http/Controllers/Api/System/DashboardController.php

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+<?php
+
+namespace App\Http\Controllers\Api\System;
+
+use App\Http\Controllers\Api\BaseApiController;
+use App\Http\Resources\System\DashboardRouteResource;
+use App\Services\Dashboard\DashboardRouteService;
+use Illuminate\Http\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+class DashboardController extends BaseApiController
+{
+    public function __construct(private DashboardRouteService $service)
+    {
+        parent::__construct();
+    }
+
+    public function route(): JsonResponse
+    {
+        $user = auth()->user();
+        if (!$user) {
+            return $this->error('Unauthorized.', Response::HTTP_UNAUTHORIZED);
+        }
+
+        $payload = $this->service->resolveForUser($user);
+
+        return $this->success([
+            'dashboard' => new DashboardRouteResource($payload),
+        ]);
+    }
+}

app/Http/Controllers/Api/System/DatabaseHealthController.php

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+<?php
+
+namespace App\Http\Controllers\Api\System;
+
+use App\Http\Controllers\Api\BaseApiController;
+use App\Services\System\DatabaseHealthService;
+use Illuminate\Http\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+class DatabaseHealthController extends BaseApiController
+{
+    public function __construct(private DatabaseHealthService $healthService)
+    {
+        parent::__construct();
+    }
+
+    public function index(): JsonResponse
+    {
+        $result = $this->healthService->check();
+        if (!$result['ok']) {
+            return $this->error('Database connection failed.', Response::HTTP_SERVICE_UNAVAILABLE, [
+                'error' => $result['error'],
+            ]);
+        }
+
+        return $this->success([
+            'ok' => true,
+        ]);
+    }
+}

app/Http/Controllers/Api/System/HealthController.php

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+<?php
+
+namespace App\Http\Controllers\Api\System;
+
+use App\Http\Controllers\Api\BaseApiController;
+use App\Http\Resources\System\HealthStatusResource;
+use App\Services\System\HealthCheckService;
+use Illuminate\Http\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+class HealthController extends BaseApiController
+{
+    public function __construct(private HealthCheckService $service)
+    {
+        parent::__construct();
+    }
+
+    public function index(): JsonResponse
+    {
+        $payload = $this->service->check();
+        $status = $payload['ok'] ? Response::HTTP_OK : Response::HTTP_SERVICE_UNAVAILABLE;
+
+        return $this->success([
+            'health' => new HealthStatusResource($payload),
+        ], 'Health check.', $status);
+    }
+}

app/Http/Controllers/Api/System/NavBuilderController.php

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+<?php
+
+namespace App\Http\Controllers\Api\System;
+
+use App\Http\Controllers\Api\BaseApiController;
+use App\Http\Requests\System\NavItemReorderRequest;
+use App\Http\Requests\System\NavItemStoreRequest;
+use App\Http\Resources\System\NavBuilderDataResource;
+use App\Http\Resources\System\NavItemResource;
+use App\Models\NavItem;
+use App\Services\Navigation\NavBuilderService;
+use App\Services\Navigation\NavbarService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Support\Facades\Log;
+use Symfony\Component\HttpFoundation\Response;
+
+class NavBuilderController extends BaseApiController
+{
+    public function __construct(
+        private NavBuilderService $builderService,
+        private NavbarService $navbarService
+    ) {
+        parent::__construct();
+    }
+
+    public function menu(): JsonResponse
+    {
+        $user = auth()->user();
+        $roles = $user?->roles()->pluck('roles.name')->map(fn ($name) => strtolower((string) $name))->toArray() ?? [];
+
+        $menu = $this->navbarService->getMenuForRoles($roles);
+
+        return $this->success([
+            'items' => NavItemResource::collection($menu),
+        ]);
+    }
+
+    public function data(): JsonResponse
+    {
+        $this->authorize('manage', NavItem::class);
+
+        $payload = $this->builderService->getAdminPayload();
+
+        return $this->success([
+            'data' => new NavBuilderDataResource($payload),
+        ]);
+    }
+
+    public function store(NavItemStoreRequest $request): JsonResponse
+    {
+        $this->authorize('manage', NavItem::class);
+
+        $result = $this->builderService->save($request->validated());
+
+        if (empty($result['ok'])) {
+            return $this->error($result['message'] ?? 'Unable to save menu item.', Response::HTTP_UNPROCESSABLE_ENTITY);
+        }
+
+        return $this->success([
+            'id' => $result['id'],
+        ], 'Menu saved.', Response::HTTP_CREATED);
+    }
+
+    public function destroy(int $id): JsonResponse
+    {
+        $this->authorize('manage', NavItem::class);
+
+        $deleted = $this->builderService->delete($id);
+
+        if (!$deleted) {
+            return $this->error('Menu item not found.', Response::HTTP_NOT_FOUND);
+        }
+
+        return $this->success(null, 'Menu item deleted.');
+    }
+
+    public function reorder(NavItemReorderRequest $request): JsonResponse
+    {
+        $this->authorize('manage', NavItem::class);
+
+        try {
+            $this->builderService->reorder($request->validated()['orders']);
+        } catch (\Throwable $e) {
+            Log::error('Nav reorder failed: ' . $e->getMessage());
+            return $this->error('Unable to reorder items.', Response::HTTP_INTERNAL_SERVER_ERROR);
+        }
+
+        return $this->success(['ok' => true], 'Menu reordered.');
+    }
+}