Remove medusa examples (#4359)

* Remove medusa examples from repository

- Removed medusa-delegate-example directory
- Removed medusa-example directory
- Removed medusa-nx-native-federation-example directory
- Removed modernjs-medusa directory
- Updated package.json workspaces to remove medusa references

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

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

* Update pnpm lockfile after removing medusa examples

- Ran pnpm install to update lockfile
- Removed dependencies from deleted medusa examples

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

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

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Co-authored-by: Claude <noreply@anthropic.com>

Author: ScriptedAlchemy