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

public/js/admin.js

@@ -144,8 +144,12 @@
             bar.style.height = h + 'px';
 
             var date = (p && p.date) ? String(p.date) : '';
-            var count = (p && p.count != null) ? String(p.count) : '0';
+            var countNum = Number(p && p.count != null ? p.count : 0);
-            bar.title = date + '：' + count + ' 单，已付 ¥' + formatMoney(paid);
+            if (!isFinite(countNum) || countNum < 0) {
+                countNum = 0;
+            }
+            var avg = countNum > 0 ? (paid / countNum) : 0;
+            bar.title = date + '｜订单 ' + String(countNum) + ' 单｜已付 ¥' + formatMoney(paid) + '｜单均 ¥' + formatMoney(avg);
 
             el.appendChild(bar);
         });

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);
+    }
+}