docs: use annotationProcessorPaths so query types generate on JDK 23+

[velo]

Fixes #1880.

The documented maven-compiler-plugin setup does not generate query types. I reproduced it on JDK 25 and JDK 21 with a minimal one-entity project.

What was wrong

The docs put querydsl-apt in the compiler plugin's <dependencies> block. That populates the plugin's classloader, not javac's annotation processor path, so the processor is never discovered. The build exits BUILD SUCCESS with no warning and no Q classes.

The reporter attributed this to implicit annotation processing being disabled in JDK 23. That is not the cause for this config — it fails on JDK 21 too, and adding <proc>full</proc> alone does not rescue it:

Config	JDK 21	JDK 25
apt in plugin <dependencies> (what the docs said)	0	0
... plus <proc>full</proc>	—	0
apt as a project dependency (what the examples do)	1	0
... plus <proc>full</proc>	—	1
annotationProcessorPaths + <proc>full</proc>	—	1

So there were two independent breakages: the documented config never worked, and the project-dependency style used by the examples regressed on JDK 23+. annotationProcessorPaths + <proc>full</proc> fixes both, and keeps the processor off the compile and runtime classpath.

Changes

Converted every querydsl-apt snippet in docs/ to annotationProcessorPaths with <proc>full</proc>, and added a note explaining the JDK 23+ behaviour to the JPA tutorial and the code generation guide.

Two extra fixes found while verifying each classifier:

• docs/tutorials/hibernate.md said to configure HibernateAnnotationProcessor but showed <classifier>jpa</classifier>, which selects JPAAnnotationProcessor. Corrected to hibernate, with hibernate-core added to the processor path (it is test scope on querydsl-apt, so it is not resolved transitively).
• docs/tutorials/mongodb.md needs morphia-core (provided scope) and querydsl-mongodb on the processor path. Without them the build fails with NoClassDefFoundError: dev/morphia/annotations/Entity and then ClassNotFoundException: com.querydsl.mongodb.Point.

jakarta.persistence-api is not required on the processor path — it is a compile-scope dependency of querydsl-apt and resolves transitively — so it has been dropped from the JPA snippets rather than carried over as the issue suggested.

Verification

Every snippet was executed as a real Maven build on JDK 25, each generating the expected query type:

Classifier	Processor path	Result
jpa	querydsl-apt:jpa	QPerson
hibernate	+ hibernate-core	QPerson
general	querydsl-apt:general	QCat
morphia	+ morphia-core, querydsl-mongodb	QDog

The compilerArgs variant in the code generation guide was also verified to still apply alongside annotationProcessorPaths.

Docs-only change; no source or build files touched.

🤖 Generated with Claude Code