feat(macro-vibes): rename BTC Signal → Macro Vibes; add MacroPanel UI

Module rename across page H1, navbar tab, URL (/en/btc → /en/macro),
all metadata/JSON-LD, sitemap, llms.txt, opengraph image, and SystemControl
copy. Old /btc route fully removed.

New components/btc/MacroPanel.tsx polls /api/macro/snapshot and lays out
the 8 indicators in four sections (Valuation / Bottom trigger reference /
Market structure / Sentiment & flows / Positioning) with tone-coloured
values, current-band threshold chips, and a single CoinGlass / source
chart link per card. Composite -100..+100 needle pulses on score change.

Also fixes the pinned bottom-reversal alert on the homepage, which still
linked to the now-404 /en/btc — now routes to /en/macro.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/[locale]/page.tsx

@@ -18,8 +18,8 @@ export async function generateMetadata({ params }: OverviewPageProps): Promise<M
     ? 'Trump Alpha 信号总览'
     : 'Trump Alpha Signal Monitor'
   const description = isZh
-    ? '实时查看 Trump Truth Social 信号、BTC 底部反转、KOL 观点和 talks-vs-trades 分歧，一页掌握核心加密信号。'
-    : 'Track Trump Truth Social signals, BTC bottom-reversal setups, KOL calls, and talks-vs-trades divergence in one live crypto dashboard.'
+    ? '实时查看 Trump Truth Social 信号、Macro Vibes 宏观氛围、KOL 观点和 talks-vs-trades 分歧，一页掌握核心加密信号。'
+    : 'Track Trump Truth Social signals, Macro Vibes (crypto macro regime), KOL calls, and talks-vs-trades divergence in one live crypto dashboard.'
   const path = `${siteUrl}/${locale}`
 
   return {