feat(admin): add dashboard, analytics and user controllers

src/Controllers/Admin/AnalyticsController.php

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+<?php
+
+namespace Bazaar\Controllers\Admin;
+
+use Bazaar\Controllers\Controller;
+use Bazaar\Core\Response;
+
+final class AnalyticsController extends Controller
+{
+    public function index(): Response
+    {
+        return $this->view('admin.analytics', [
+            'salesByDay' => $this->ctx->analytics->salesByDay(14),
+            'topProducts' => $this->ctx->analytics->topProducts(5),
+            'averageOrderCents' => $this->ctx->analytics->averageOrderValueCents(),
+            'unitsSold' => $this->ctx->analytics->unitsSold(),
+            'couponUsage' => $this->ctx->analytics->couponUsage(),
+            'revenueCents' => $this->ctx->orders->revenueCents(),
+            'lowStock' => $this->ctx->products->lowStock(5),
+        ], 'admin.layout');
+    }
+}

src/Controllers/Admin/DashboardController.php

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+<?php
+
+namespace Bazaar\Controllers\Admin;
+
+use Bazaar\Controllers\Controller;
+use Bazaar\Core\Response;
+
+final class DashboardController extends Controller
+{
+    public function index(): Response
+    {
+        return $this->view('admin.dashboard', [
+            'productCount' => $this->ctx->products->count(),
+            'pendingCount' => $this->ctx->orders->countByStatus('pending'),
+            'paidCount' => $this->ctx->orders->countByStatus('paid'),
+            'fulfilledCount' => $this->ctx->orders->countByStatus('fulfilled'),
+            'orderCount' => $this->ctx->orders->count(),
+            'revenueCents' => $this->ctx->orders->revenueCents(),
+            'lowStock' => $this->ctx->products->lowStock(5),
+            'recentOrders' => $this->ctx->orders->recent(6),
+        ], 'admin.layout');
+    }
+}

src/Controllers/Admin/UserController.php

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+<?php
+
+namespace Bazaar\Controllers\Admin;
+
+use Bazaar\Controllers\Controller;
+use Bazaar\Core\Response;
+use Bazaar\Support\Role;
+
+final class UserController extends Controller
+{
+    public function index(): Response
+    {
+        return $this->view('admin.users.index', [
+            'users' => $this->ctx->users->all(),
+            'roles' => Role::all(),
+        ], 'admin.layout');
+    }
+
+    public function updateRole(string $id): Response
+    {
+        $userId = (int) $id;
+        $role = (string) $this->ctx->request->input('role', Role::customer);
+        if (!in_array($role, Role::all(), true)) {
+            return $this->redirect('/admin/users');
+        }
+
+        if ($userId === (int) $this->ctx->auth->id()) {
+            $this->ctx->session->flash('error', 'You cannot change your own role.');
+            return $this->redirect('/admin/users');
+        }
+
+        $this->ctx->users->setRole($userId, $role);
+        $this->ctx->session->flash('success', 'Role updated.');
+        return $this->redirect('/admin/users');
+    }
+}