feat(admin): 平台订单筛选增加线索ID（lead_id）与上下文提示

tests/Feature/AdminPlatformOrderIndexLeadIdFilterFormFieldTest.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderIndexLeadIdFilterFormFieldTest 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_index_should_render_lead_id_filter_field(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin/platform-orders');
+        $res->assertOk();
+
+        $res->assertSee('name="lead_id"', false);
+        $res->assertSee('线索ID', false);
+    }
+
+    public function test_index_should_render_lead_context_badge_when_filtered(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin/platform-orders?lead_id=12');
+        $res->assertOk();
+
+        $res->assertSee('当前线索：#12', false);
+    }
+}