fix(ci): 修 flutter analyze 闸长期 exit 1(形同虚设)

发现:CI flutter analyze 退出码 1(1204 个 info,0 error/warning),其中 1191 来自
第三方 vendored 包 lucide_icons_patched —— 这道闸一直红/无效。
- analysis_options.yaml:exclude packages/lucide_icons_patched/**(去 1191 噪音)
- ci.yml:flutter analyze --no-fatal-infos(info 是建议级不该硬挡 merge;
  error/warning 仍致命)→ analyze EXIT 0、闸真正可用
- 顺手清 11 个 clean 文件 info:auth_api 删 >>>AUTHLOG 调试 print 残留(+unused sw)、
  account_page/plan_card withOpacity→withValues、vpn_bridge where(is Map)→whereType、
  测试文件删多余 import + final→const
- 剩 2 个 info 在 stats-overhaul dirty 文件(stats_page/device_stat_row),留其合并清
- 验证:flutter analyze --no-fatal-infos EXIT 0(1204→2)、flutter test 48 全过

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/widgets/plan_card.dart

@@ -27,7 +27,7 @@ class PlanCard extends StatelessWidget {
   Widget build(BuildContext context) {
     final c = context.pangolin;
     final onCard = featured ? PangolinColors.white : c.fg1;
-    final subColor = featured ? PangolinColors.white.withOpacity(0.92) : c.fg2;
+    final subColor = featured ? PangolinColors.white.withValues(alpha: 0.92) : c.fg2;
 
     final card = Container(
       padding: const EdgeInsets.fromLTRB(20, 22, 20, 20),
@@ -44,7 +44,7 @@ class PlanCard extends StatelessWidget {
         crossAxisAlignment: CrossAxisAlignment.start,
         mainAxisSize: MainAxisSize.min,
         children: [
-          Text(name, style: PangolinText.sm.copyWith(color: featured ? PangolinColors.white.withOpacity(0.85) : c.fg2, fontWeight: FontWeight.w600)),
+          Text(name, style: PangolinText.sm.copyWith(color: featured ? PangolinColors.white.withValues(alpha: 0.85) : c.fg2, fontWeight: FontWeight.w600)),
           const SizedBox(height: 6),
           Row(
             crossAxisAlignment: CrossAxisAlignment.baseline,