chore(admin-dashboard): enrich trend bar tooltip with avg paid

tests/Feature/AdminDashboardTrendMiniChartTooltipShouldIncludeAvgTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminDashboardTrendMiniChartTooltipShouldIncludeAvgTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_trend_bar_tooltip_should_include_avg_paid_per_order(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $this->get('/admin')->assertOk();
+
+        $js = (string) file_get_contents(public_path('js/admin.js'));
+
+        // 护栏：趋势 bar 的 tooltip 应包含“单均”口径（更便于运营理解波动）
+        $this->assertStringContainsString("'｜单均 ¥'", $js);
+        $this->assertStringContainsString('formatMoney(avg)', $js);
+    }
+}