refactor(init): remove dead determine-pm step label

The `determine-pm` step was merged into `detect-platform` in
cli-init-api, so the UI label is no longer needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: betegon

src/lib/init/clack-utils.ts

@@ -63,7 +63,6 @@ export const STEP_LABELS: Record<string, string> = {
   "detect-platform": "Detecting platform and framework",
   "ensure-sentry-project": "Setting up Sentry project",
   "select-features": "Selecting features",
-  "determine-pm": "Detecting package manager",
   "install-deps": "Installing dependencies",
   "plan-codemods": "Planning code modifications",
   "apply-codemods": "Applying code modifications",