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]/trump/page.tsx

@@ -27,7 +27,7 @@ export async function generateMetadata({
           '特朗普发帖行情',
           'Trump 自动交易',
           'Hyperliquid 机器人',
-          'Trump BTC 信号',
+          'Trump 加密信号',
         ]
       : [
           'Trump crypto signal',
@@ -36,7 +36,6 @@ export async function generateMetadata({
           'Trump market signal',
           'crypto auto-trader',
           'Hyperliquid bot',
-          'Trump BTC signal',
         ],
     openGraph: {
       title: isZh ? 'Trump Truth Social 实时信号 | Trump Alpha' : 'Trump Truth Social Signals | Trump Alpha',