chore: complete fumadocs -> @hanzo/docs rebrand

- Rename all packages from fumadocs-* to @hanzo/docs-*
- Update all imports across apps, examples, and packages
- Update documentation and content references
- Sync lockfile with new package names

examples/python/next.config.mjs

@@ -1,4 +1,4 @@
-import { createMDX } from 'fumadocs-mdx/next';
+import { createMDX } from '@hanzo/docs/mdx/next';
 
 const withMDX = createMDX();