Develop + SDK docs for the Spring-style Java model: new "Coming from Spring Boot" guide, per-language split, annotation-free extensions

[iliyan-velichkov]

Summary

Updates the Develop guide and the Java SDK reference to the Spring-style client-Java model introduced in eclipse-dirigible/dirigible#6051, and reorganizes the affected pages so a reader instantly finds the language they want.

New: "Coming from Spring Boot"

A new docs/help/develop/coming-from-spring-boot.md (linked from the Develop sidebar) for developers who already know Spring:

• A Spring/Jakarta → Dirigible mapping table (@Component, @Autowired→@Inject, ApplicationContext→Beans, @RestController→@Controller, Spring Data→JavaRepository, @Scheduled/@JmsListener, TextWebSocketHandler/@ServerEndpoint, @RolesAllowed→@Roles, lifecycle).
• A "Side-by-side: implementing each artifact" section that shows the Spring example first, then the Dirigible one for Listener, Job, WebSocket, Controller, Repository and Extension — both the self-describing-interface and method-level styles — so the similarity is obvious. Every snippet (both Spring and Dirigible) is fully imported and copy-paste-ready.

Develop pages — current model + per-language split

• dependency-injection — @Component, constructor / field / collection injection, Beans; the "How it is wired" section is kept implementation-agnostic (behavioural guarantees only, no internal class names) so it won't go stale.
• scheduled-jobs / message-listeners / websockets — the two clean styles (self-describing interface vs method-level annotation); reflective/hybrid wording removed; real examples linked to the matching sample repos.
• extension-providers — rewritten to the annotation-free model (plain interface + @Component contribution + List<…> collection injection / Extensions.find); the "Consume at runtime" section split into clear Java vs TypeScript/JavaScript subsections.
• rest-apis and entities-and-persistence — the former "side by side" code blocks are now separate ### Java / ### TypeScript / JavaScript subsections (Java first); constructor injection shown.
• security-and-roles, working-with-data, working-with-files-and-cms, working-with-git — @Roles, the Java User API, and the IO/CMS/Git examples split per language; the tenancy/multi-tenancy sections removed from entities-and-persistence, working-with-data and working-with-files-and-cms.
• decorators-model, languages/java, develop/index — corrected the stale "@Scheduled/@Listener/@Extension are meta-@Component" claim and dropped removed @Extension/@ExtensionPoint references.

SDK reference (/sdk)

• component — @Component, @Inject (field/constructor/parameter + collection), @Repository as a bean; new Beans page wired into the sidebar.
• job / messaging / net — self-describing JobHandler/MessageHandler/WebsocketHandler; method-level @Scheduled/@Listener; new @OnOpen/@OnMessage/@OnError/@OnClose; reflective/class-level wording removed.
• extensions — annotation-free model; Extensions.find/getExtensions clarified.
• db/store, http/decorators, get-started — Beans instead of BeanProvider for client access; @Controller is a bean (constructor injection).

Other help & blog pages

Swept docs/help/** and the 2026-05-19 Java-decorators blog so they no longer present the removed/old API (no client-facing BeanProvider, no @Extension/@ExtensionPoint, no @Scheduled(cron=…) for Dirigible, no removed internal class names). TypeScript/JavaScript content and the classic registry artefacts (.job, .listener, .extension, …) are unchanged.

Documents eclipse-dirigible/dirigible#6051 — merge after it (and after the sample PRs the examples reference).

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