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/page.tsx

@@ -326,11 +326,11 @@ export default function LandingPage() {
             />
             <PillarCard
               tag="Daily · macro"
-              title="BTC Bottom Reversal"
+              title="Macro Vibes"
               desc="2-of-3 confluence across AHR999, the 200-week moving average, and Pi Cycle Bottom. Rare, high-conviction long-only entries."
               metric="2–4×"
               metricLabel="signals per cycle"
-              href="/en/btc"
+              href="/en/macro"
             />
             <PillarCard
               tag="Daily · narrative"
@@ -354,7 +354,7 @@ export default function LandingPage() {
               desc="Funding spikes → crowded trade unwinds. At multi-cycle extremes, mean-reversion is the highest-probability play."
               metric="±0.1%"
               metricLabel="threshold trigger"
-              href="/en/btc"
+              href="/en/macro"
             />
             <PillarCard
               tag="On demand · execution"