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/screens/account_page.dart

@@ -179,7 +179,7 @@ class _PlanBanner extends StatelessWidget {
       child: Row(children: [
         Container(
           width: 44, height: 44,
-          decoration: BoxDecoration(color: PangolinColors.white.withOpacity(0.18), shape: BoxShape.circle),
+          decoration: BoxDecoration(color: PangolinColors.white.withValues(alpha: 0.18), shape: BoxShape.circle),
           child: const Icon(PangolinIcons.crown, size: 22, color: PangolinColors.white),
         ),
         const SizedBox(width: 12),
@@ -187,7 +187,7 @@ class _PlanBanner extends StatelessWidget {
           Text(email, style: const TextStyle(color: PangolinColors.white, fontWeight: FontWeight.w700, fontSize: 16)),
           const SizedBox(height: 4),
           Text(expiresLabel.isEmpty ? t.proMember : '${t.proMember} · $expiresLabel',
-              style: TextStyle(color: PangolinColors.white.withOpacity(0.85), fontSize: 12)),
+              style: TextStyle(color: PangolinColors.white.withValues(alpha: 0.85), fontSize: 12)),
         ])),
         FilledButton(
           onPressed: onUpgrade,