fix(api): 修复节点流量限额共享统计与父子显隐联动

统一节点流量统计与限额展示口径，节点详情新增昨日流量，
并让今日、昨日和本月使用清晰的半开时间窗口聚合

同 machine_id 或同 host 的节点现在共享当前账期已用流量，
管理端优先使用后端 traffic_limit_snapshot 展示月额度状态，
mi-node 下发的 current_used 也改为共享账期统计

新增 parent_auto_hidden 标记与父节点显隐联动服务，父节点
因自动上线或流量限额变为不可展示时会隐藏当前显示的子节点，
恢复时只恢复这批自动隐藏的子节点，避免覆盖手动操作

database/migrations/2026_04_29_015400_add_parent_auto_visibility_fields_to_v2_server_table.php

@@ -0,0 +1,44 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('v2_server', function (Blueprint $table) {
+            if (!Schema::hasColumn('v2_server', 'parent_auto_hidden')) {
+                $table->boolean('parent_auto_hidden')
+                    ->default(false)
+                    ->after('gfw_auto_action_at')
+                    ->comment('Hidden automatically because parent node is unavailable');
+            }
+
+            if (!Schema::hasColumn('v2_server', 'parent_auto_action_at')) {
+                $table->unsignedBigInteger('parent_auto_action_at')
+                    ->nullable()
+                    ->after('parent_auto_hidden')
+                    ->comment('Last parent visibility sync action timestamp');
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('v2_server', function (Blueprint $table) {
+            foreach (['parent_auto_hidden', 'parent_auto_action_at'] as $column) {
+                if (Schema::hasColumn('v2_server', $column)) {
+                    $table->dropColumn($column);
+                }
+            }
+        });
+    }
+};