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/sitemap.ts

@@ -21,7 +21,7 @@ const routes: Array<{
 }> = [
   { path: '',              priority: 1.0, freq: 'hourly'  },
   { path: '/trump',        priority: 0.9, freq: 'hourly'  },
-  { path: '/btc',          priority: 0.9, freq: 'daily'   },
+  { path: '/macro',          priority: 0.9, freq: 'daily'   },
   { path: '/kol',          priority: 0.9, freq: 'daily'   },
   { path: '/trades',       priority: 0.8, freq: 'daily'   },
   { path: '/analytics',    priority: 0.7, freq: 'daily'   },