Add node_modules volume to docker-compose

[pathwaynavigator]

Added volume for node_modules and defined it in the volumes section.

Fixes #2380 (frontend part)

Changes description & testing suggestions

Changes:

• Added node_modules_data:/ng-app/node_modules volume mount to the app service
• Added node_modules_data volume definition with driver: local

Testing:

• Verified npm install completes successfully without Docker Desktop stalling
• Confirmed node_modules is created at /ng-app/node_modules in the container
• Tested that the volume is properly created and used by Docker
• No functional changes to the application - this is purely a Docker configuration improvement

Related:

• Backend fix: vendor/
• Issue: Docker Desktop local setup can stall containers during dependency install (bind-mounted vendor / node_modules) Forus#2380

Developers checklist

• Check that dusk tests are working locally on compatible branch - N/A (Docker config change, no code changes)
• Mobile version of changes is developed - N/A (Docker config change)

QA checklist

• N/A (Docker configuration only, no UI/CSS changes)

Note: This is a Docker configuration change only. No application code, UI, or functionality is affected. The change improves local development experience by preventing Docker Desktop from stalling during dependency installation, as described in issue #2380.