docs: restructure website, optimize HTML, gitignore private files

Website docs (website/docs/):
- Delete 6 stale -md.html duplicates
- Rename docs-clients/miners/developers → clients/miners/developers.html
- Unify header/nav across all 15 pages (new .site-header pattern)
- Fix 34 dead href=# links with real targets
- Upgrade Font Awesome v4→v6 in index.html
- Replace search stub with live client-side search (15-page index)
- Extract all inline CSS into shared docs.css (+630 lines)
- Extract inline theme JS into shared theme.js
- Strip inline style= attributes from 10+ pages
- Add .announce-banner, .source-links, .search-results CSS classes
- Add Markdown Source links to clients/miners/developers pages
- Update components.html title to Architecture & Components
- Move browser-wallet.html to website/wallet/, leave redirect
- Update all dates to February 2026

Website root:
- Delete 6 root-level duplicate HTML files (160KB saved)
- Rewire index.html and 404.html links

Root README.md:
- Fix 8 broken doc links to new numbered folder structure
- Update copyright to 2026

.gitignore + .example files:
- Gitignore private files: .aitbc.yaml, .env, deploy scripts,
  GPU scripts, service scripts, infra configs, .windsurf/, website README
- Create 7 .example files for GitHub users with sanitized templates
- Untrack 47 previously committed private files

Live server:
- Push all website files to aitbc-cascade:/var/www/html/
- Clean stale admin.html and index.nginx-debian.html

infra/helm/values/prod.yaml.example

@@ -0,0 +1,44 @@
+# AITBC Production Helm Values
+# Copy to prod.yaml and adjust for your cluster
+
+replicaCount: 1
+
+coordinator:
+  image: aitbc/coordinator-api:latest
+  port: 8000
+  env:
+    APP_ENV: production
+    DATABASE_URL: postgresql://aitbc:YOUR_DB_PASSWORD@postgres:5432/aitbc
+    HMAC_SECRET: YOUR_HMAC_SECRET
+    ALLOW_ORIGINS: '["https://YOUR_DOMAIN"]'
+
+blockchain:
+  image: aitbc/blockchain-node:latest
+  rpcPort: 9080
+  p2pPort: 9090
+  env:
+    NETWORK: mainnet
+    CONSENSUS_MODE: BALANCED
+
+ingress:
+  enabled: true
+  host: YOUR_DOMAIN
+  tls:
+    enabled: true
+    secretName: aitbc-tls
+
+resources:
+  coordinator:
+    requests:
+      cpu: 250m
+      memory: 512Mi
+    limits:
+      cpu: 1000m
+      memory: 1Gi
+  blockchain:
+    requests:
+      cpu: 500m
+      memory: 1Gi
+    limits:
+      cpu: 2000m
+      memory: 4Gi