feat(adapters): mark EBA-superseded adapters as legacy and collapse them

The 12 old adapters that now have an EBA replacement are tagged
`spec.legacy: true` in their source manifests. Principle: don't delete,
de-emphasize.

- sources/*.yaml (aiocqhttp, dingtalk, discord, kook, lark,
  officialaccount, qqofficial, slack, telegram, wecom, wecombot,
  wecomcs): add spec.legacy: true
- Adapter / IChooseAdapterEntity types: add optional legacy flag
- BotForm adapter Select: split legacy adapters into a collapsed,
  grayscale group at the bottom with an explanatory hint; auto-expand
  when the bot already uses a legacy adapter
- Wizard platform picker: same collapsed legacy section
- i18n: legacyAdapters / legacyAdaptersHint (zh-Hans, en-US)

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

web/src/i18n/locales/en-US.ts

@@ -339,6 +339,9 @@ const enUS = {
     deleteConfirmation: 'Are you sure you want to delete this bot?',
     platformAdapter: 'Platform/Adapter Selection',
     selectAdapter: 'Select Adapter',
+    legacyAdapters: 'Legacy adapters',
+    legacyAdaptersHint:
+      'These adapters are superseded by their newer (EBA) versions. They are kept only for existing configurations and are not recommended for new bots.',
     adapterConfig: 'Adapter Configuration',
     viewAdapterDocs: 'View Docs',
     bindPipeline: 'Bind Pipeline',

web/src/i18n/locales/zh-Hans.ts

@@ -324,6 +324,9 @@ const zhHans = {
     deleteConfirmation: '你确定要删除这个机器人吗？',
     platformAdapter: '平台/适配器选择',
     selectAdapter: '选择适配器',
+    legacyAdapters: '旧版适配器',
+    legacyAdaptersHint:
+      '这些适配器已被新版（EBA 架构）取代，仅为兼容存量配置保留，不建议新建机器人时使用。',
     adapterConfig: '适配器配置',
     viewAdapterDocs: '查看文档',
     bindPipeline: '绑定流水线',