Play Framework

Remove jQuery from framework, delete sample apps, update build

- Remove jQuery from app skeleton, console, docviewer, test runner,
  and welcome tag
- Rewrite docviewer navigation.js to vanilla JS (querySelector, etc.)
- Rewrite test runner ~270 lines of inline jQuery to vanilla JS
  using fetch(), classList, querySelectorAll, and event delegation
- Delete all sample apps except just-test-cases and i-am-a-developer
  (kept for ant test)
- Remove deleted sample app references from build.xml test target
- Remove build-test-modules target (testModule was in deleted samples)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>