feat(docs): add comprehensive documentation page with sidebar navigation

- Create /docs page with complete TPMJS documentation
- Add sidebar navigation with section tracking
- Document SDK reference (registrySearchTool, registryExecuteTool)
- Document REST API endpoints
- Document publishing guide and TPMJS specification
- Add advanced sections (override execute, custom wrappers, self-hosting)
- Include FAQ and troubleshooting sections
- Add Docs link to main navigation header

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/web/src/app/docs/layout.tsx

@@ -0,0 +1,16 @@
+import type { Metadata } from 'next';
+
+export const metadata: Metadata = {
+  title: 'Documentation | TPMJS',
+  description:
+    'Complete documentation for TPMJS - the registry for AI tools. Learn how to use the SDK, API, and publish your own tools.',
+  openGraph: {
+    title: 'TPMJS Documentation',
+    description:
+      'Complete documentation for TPMJS - the registry for AI tools. Learn how to use the SDK, API, and publish your own tools.',
+  },
+};
+
+export default function DocsLayout({ children }: { children: React.ReactNode }) {
+  return children;
+}

apps/web/src/components/AppHeader.tsx

@@ -28,6 +28,11 @@ export function AppHeader(): React.ReactElement {
               Tools
             </Button>
           </Link>
+          <Link href="/docs">
+            <Button variant="ghost" size="sm" className="text-foreground hover:text-foreground">
+              Docs
+            </Button>
+          </Link>
           <Link href="/how-it-works">
             <Button variant="ghost" size="sm" className="text-foreground hover:text-foreground">
               How It Works