Play Framework

fix(bundle): list a nested lib jar on the classpath where the bundle ships it

PlayBundleTask collects the application's lib/ jars recursively and
ships each one flattened, as lib/<name>, but wrote its .classpath entry
from the path below lib/. A jar kept in a subdirectory, lib/vendor/x.jar,
was therefore listed at a path the bundle does not contain, and its
classes were missing at runtime with nothing said at build time.

The entry is now written the way the jar is shipped.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KDUoh3KhBpfjXn4rV6H356