fix(seo/geo): canonical URLs, OG KOL count, FAQ key-storage copy, expand llms.txt

SEO fixes:
- canonical on trump/macro/kol pages now hardcodes /en/ instead of
  /${locale}/ — prevents /zh/* routes (i18n shelved, routes still resolve)
  from generating duplicate-content signals pointing to /zh/ canonicals
- OG image: "15 KOL feeds" → "19" (matches kol_substack.py KOL_FEEDS count)
- FAQ JSON-LD: corrected API key storage description ("stored encrypted in
  your browser's local settings" was wrong — key is server-side encrypted,
  not stored in the browser)

GEO (Generative Engine Optimization):
- llms.txt fully rewritten: +full KOL list (all 19 named), +explicit
  differentiation section, +who-this-is-for, +technology stack detail
  (model names, price sources, DB), +Hyperliquid and isolated-margin
  definitions. AI crawlers (Perplexity, ChatGPT, Claude) use this file
  directly when answering questions about the product.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/[locale]/kol/page.tsx

@@ -50,7 +50,7 @@ export async function generateMetadata({
         : '19 KOL feeds (Hayes, Bankless, Empire…) AI-scored daily. Plus talks-vs-trades: when their wallets contradict their words.',
     },
     alternates: {
-      canonical: `${siteUrl}/${locale}/kol`,
+      canonical: `${siteUrl}/en/kol`,
       languages: {
         en: `${siteUrl}/en/kol`,
         'x-default': `${siteUrl}/en/kol`,

app/[locale]/macro/page.tsx

@@ -52,7 +52,7 @@ export async function generateMetadata({
         : 'Macro vibes for crypto. Read what is about to happen before price prints it.',
     },
     alternates: {
-      canonical: `${siteUrl}/${locale}/macro`,
+      canonical: `${siteUrl}/en/macro`,
       languages: {
         en: `${siteUrl}/en/macro`,
         'x-default': `${siteUrl}/en/macro`,

app/[locale]/trump/page.tsx

@@ -44,7 +44,7 @@ export async function generateMetadata({
         : 'Every Trump post scored by AI in under 3 seconds. LONG, SHORT, or NOISE — with optional Hyperliquid auto-trade.',
     },
     alternates: {
-      canonical: `${siteUrl}/${locale}/trump`,
+      canonical: `${siteUrl}/en/trump`,
       languages: {
         en: `${siteUrl}/en/trump`,
         'x-default': `${siteUrl}/en/trump`,

app/layout.tsx

@@ -214,7 +214,7 @@ const jsonLd = {
           name: 'Does Trump Alpha store my trading keys?',
           acceptedAnswer: {
             '@type': 'Answer',
-            text: 'Your Hyperliquid API key is stored encrypted in your browser\'s local settings and sent only to the Trump Alpha backend to execute trades. The key is scoped to trade-only permissions — it cannot withdraw funds. We never ask for your MetaMask seed phrase or any wallet private key.',
+            text: 'Your Hyperliquid API key is encrypted and stored securely on the Trump Alpha server — it never sits in your browser. The key is scoped to trade-only permissions and cannot withdraw funds. We never ask for your MetaMask seed phrase or any wallet private key.',
           },
         },
       ],

app/opengraph-image.tsx

@@ -153,7 +153,7 @@ export default function OGImage() {
         >
           {[
             { v: '<3s', l: 'post → position' },
-            { v: '15', l: 'KOL feeds' },
+            { v: '19', l: 'KOL feeds' },
             { v: '$0', l: 'platform fee' },
           ].map((s) => (
             <div key={s.l} style={{ display: 'flex', gap: 10, alignItems: 'baseline' }}>