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/lib/layout.shared.tsx

@@ -1,4 +1,4 @@
-import type { BaseLayoutProps } from 'fumadocs-ui/layouts/shared';
+import type { BaseLayoutProps } from '@hanzo/docs/ui/layouts/shared';
 
 export function baseOptions(): BaseLayoutProps {
   return {

examples/python/lib/source.ts

@@ -1,5 +1,5 @@
-import { docs } from 'fumadocs-mdx:collections/server';
-import { loader } from 'fumadocs-core/source';
+import { docs } from '@hanzo/docs/mdx:collections/server';
+import { loader } from '@hanzo/docs/core/source';
 
 // See https://fumadocs.dev/docs/headless/source-api for more info
 export const source = loader({