[it-education-md]

Closes #31793

Summary

• Add deno create as a first-class CLI subcommand
• Route it to the existing init package path (InitFlags.package)
• Keep npm-only behavior for create (no JSR support yet).
• Keep --npm support (similar to deno init) while also supporting explicit npm: package input.
• Fix npm-prefixed normalization to avoid npm:create-npm:*

Test plan

• cargo check -p deno passes
• cargo test -p deno create --lib passes
• cargo test -p deno npm_name_to_create_package_test --lib passes

Manual check

• deno create --yes vite
  Parser error: Missing npm: prefix. For example: deno create npm:vite.
• deno create --yes --npm vite
  Resolves to create-vite.
• deno create --yes npm:vite
  Resolves to create-vite.
• deno create --yes npm:vite my-project
  Parser error (missing -- before package args).
• deno create --yes npm:vite -- my-project
  Resolves to create-vite with forwarded arg my-project.
• deno create --yes jsr:@std/http
  Parser error: JSR packages are not supported by deno create yet. Use npm: or --npm.
• deno create --yes --jsr @std/http
  Parser error: unexpected argument --jsr.
• deno create --yes npm:
  Parser error: Missing package name after 'npm:' prefix.

[CLAassistant]

All committers have signed the CLA.

[dsherret]

LGTM. Thanks!