fix: migrate to nested _meta.ui.resourceUri format

[AngeloGiacco]

Summary

• Migrate remaining examples (qr-server, transcript-server, map-server) from the deprecated flat _meta["ui/resourceUri"] format to the newer nested _meta.ui.resourceUri format
• Update registerAppTool JSDoc example in src/server/index.ts to show the new format
• Remove unused RESOURCE_URI_META_KEY imports from migrated examples

This ensures mobile client compatibility, which only supports the nested meta schema URI format.

Test plan

• Verify examples still render correctly in the basic-host
• Confirm npm run build:all succeeds

🤖 Generated with Claude Code

[ochafik]

Thanks @AngeloGiacco ! Could you please resolve the conflicts before this can be merged?