Revert "npm login" (#4299)

Reverts Stirling-Tools/Stirling-PDF#4296

.github/workflows/frontend-licenses-update.yml

@@ -51,10 +51,6 @@ jobs:
           cache: 'npm'
           cache-dependency-path: frontend/package-lock.json
 
-      - name: Configure npm with token (if available)
-        if: secrets.NPM_TOKEN != ''
-        run: echo "//registry.npmjs.org/:_authToken=${{ secrets.NPM_TOKEN }}" > ~/.npmrc
-
       - name: Install frontend dependencies
         working-directory: frontend
         run: npm ci
@@ -62,10 +58,6 @@ jobs:
       - name: Generate frontend license report
         working-directory: frontend
         run: npm run generate-licenses
-        
-      - name: Clean up npmrc
-        if: always() && secrets.NPM_TOKEN != ''
-        run: rm -f ~/.npmrc
 
       - name: Check for license warnings
         run: |