refactor: extract docs to standalone site at autoforge.cc

- Remove embedded documentation system (18 files) from main UI:
  - Delete ui/src/components/docs/ (DocsPage, DocsContent, DocsSidebar,
    DocsSearch, docsData, and all 13 section components)
  - Delete ui/src/hooks/useHashRoute.ts (only used for docs routing)
- Simplify ui/src/main.tsx: remove Router component, render App directly
  inside QueryClientProvider (no more hash-based routing)
- Update docs button in App.tsx header to open https://autoforge.cc in
  a new tab instead of navigating to #/docs hash route
- Add logo to header
- Add temp-docs/ to .gitignore
- Update CLAUDE.md with current architecture documentation

The documentation has been extracted into a separate repository and
deployed as a standalone Vite + React site at https://autoforge.cc.
This reduces the main UI bundle and decouples docs from app releases.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/src/hooks/useHashRoute.ts

@@ -1,36 +0,0 @@
-import { useState, useEffect, useCallback } from 'react'
-
-export type Route = 'app' | 'docs'
-
-interface HashRouteState {
-  route: Route
-  section: string | null
-  navigate: (hash: string) => void
-}
-
-function parseHash(hash: string): { route: Route; section: string | null } {
-  const cleaned = hash.replace(/^#\/?/, '')
-  if (cleaned === 'docs' || cleaned.startsWith('docs/')) {
-    const section = cleaned.slice(5) || null // Remove 'docs/' prefix
-    return { route: 'docs', section }
-  }
-  return { route: 'app', section: null }
-}
-
-export function useHashRoute(): HashRouteState {
-  const [state, setState] = useState(() => parseHash(window.location.hash))
-
-  useEffect(() => {
-    const handleHashChange = () => {
-      setState(parseHash(window.location.hash))
-    }
-    window.addEventListener('hashchange', handleHashChange)
-    return () => window.removeEventListener('hashchange', handleHashChange)
-  }, [])
-
-  const navigate = useCallback((hash: string) => {
-    window.location.hash = hash
-  }, [])
-
-  return { ...state, navigate }
-}