Play Framework

chore: drop crud/secure modules and remove Ant IDE targets

This fork won't be using the bundled crud (admin scaffolding) and secure
(auth helpers) modules, so carrying them imposes maintenance cost without
benefit. Drop the modules wholesale plus all related plumbing:

- modules/crud/ and modules/secure/ deleted
- Ivy resolvers (playCoreCrud, playCoreSecure) and YamlParser dep-name
  expansion for both removed
- Dedicated module docs (crud.textile, secure.textile) deleted in en+ja
- Tutorial chapters built around them (guide7, guide8, guide12) deleted;
  guide6/guide11/home.textile navigation relinked, leaving the sequence
  guide1-6, guide9-11
- Cross-references trimmed in modules.textile, dependency.textile,
  routes.textile, CLAUDE.md, AGENTS.md, SECURITY.md

Also remove all IDE-specific Ant targets in framework/build.xml — the
nb-* Netbeans profiling/run targets plus debug-test-single, which used
the <nbjpdastart> task that required a Netbeans install and was already
broken for everyone else. Modern dev uses Gradle import in IntelliJ.

Misc cleanup from a dead-code audit:
- Populate empty framework/templates/errors/404.json so JSON 404s have
  a body matching 500.json's shape
- Refresh stale doc references: WAR export FAQ, Python CLI rationale,
  Mac install path, 1.5.x doc links in README, JDK 1.8 examples in
  ISSUE_TEMPLATE

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>