docs: fix UserPreDeleteEvent accessors in README

[devondragon]

The README described UserPreDeleteEvent as carrying the User entity via event.getUser() (line 968) and used event.getUser().getId() in the listener example (line 998). Since 5.0.0 the event exposes only getUserId() and getUserEmail() (UserPreDeleteEvent.java:52,61); the example did not compile as written. Updated the description and the example to match the class and the demo app's actual UserProfileDeletionListener. Found while rewriting the demo app's docs (devondragon/SpringUserFrameworkDemoApp#85).

[claude]

Reviewed. This is a small, accurate doc fix — verified against UserPreDeleteEvent.java (src/main/java/com/digitalsanctuary/spring/user/event/UserPreDeleteEvent.java), which as of 5.0.0 only exposes getUserId() and getUserEmail(), not getUser(). The updated README text and code example match the actual API.

• Correctness: ✅ Confirmed the class no longer carries the User entity (by design, to avoid detached-entity/LazyInitializationException issues per the class Javadoc). The old event.getUser().getId() example genuinely wouldn't compile.
• Consistency: ✅ Checked the rest of README.md for other UserPreDeleteEvent references (lines 1186, 1200-1201) — they already use getUserEmail()/getUserId(), so this PR closes the last stale reference and the doc is now internally consistent.
• Scope: Minimal, docs-only, 2-line diff — no code/behavior changes, no tests needed.

No issues found. LGTM.

[Copilot]

Pull request overview

Updates the library’s README documentation so consuming applications can correctly handle UserPreDeleteEvent as it exists since 5.0.0 (carrying scalar userId/userEmail rather than a User entity), ensuring the provided listener example matches the actual public API.

Changes:

• Corrected the UserPreDeleteEvent description to reflect that it exposes getUserId() and getUserEmail() (and does not carry a User entity).
• Updated the README’s listener example to use event.getUserId() instead of event.getUser().getId().

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