docs: correct schema-mode default to fail and document Java field finders

[zantvoort]

Summary

Follow-up to the 1.12.0 release. Two doc gaps surfaced when re-checking the adoption items against what actually shipped:

1. Schema-validation default is documented wrong. As of 1.12.0 schema validation defaults to fail in the Spring Boot starters and the Ktor plugin (StormAutoConfiguration.java:84, .kt:80, and Storm.kt:93 all ?: "fail", with tests asserting "validation must run in fail mode by default"). Several docs still said the default is none, so a new adopter whose schema does not match would hit a boot failure the docs told them could not happen. Aligned every stale spot with the shipped behavior and with the canonical configuration.md#schema-validation section (which was already correct):

• configuration.md — properties table, YAML/HOCON default examples, and the Production Hardening note.
• spring-integration.md — schema-mode YAML default and prose.
• validation.md — YAML comment, mode-table ordering, and properties table (also Spring Boot only -> Spring Boot and Ktor).
• ktor-integration.md — schema-validation prose and mode table.

2. Java field-based finders were undocumented. 1.12 added findBy / findAllBy / getBy (plus Ref and findRefBy/getRefBy variants) on the Java EntityRepository, keyed on any Metamodel<E, V> field rather than only unique keys (findAllBy supports single value, Ref, and IN-list). queries.md only showed the Kotlin/unique-key form. The Java examples now use these finders in place of the verbose select().where(...).getResultList() boilerplate they replace.

Note on visibility

Both docs/ (serves /docs/next) and the frozen versioned_docs/version-1.12.0/ snapshot (serves the live /docs/*) are updated, so the schema-mode correction reaches the live site without waiting for a 1.12.1 release. Touching a versioned snapshot is a deliberate one-time exception to the normally-frozen rule, justified because this is a live-facing accuracy fix rather than new content. The snapshot files were byte-identical to the pre-edit docs/ sources, so the two commits apply exactly the same changes.

Verification

• grep confirms no remaining "default: none" / "skipped (default)" schema claims and no "Spring Boot only" for schema_mode in docs/ or the snapshot.
• Method signatures verified against storm-java21/src/main/java/st/orm/repository/EntityRepository.java (@since 1.12).