fix(java): show Lombok generated members in Structure (#2046)

Refs #2026

The Java defaults left JDT LS's generated-symbol filter on, so Lombok getters, setters, constructors, builder methods and logger fields were missing from Structure and File Structure. Enable `java.symbols.includeGeneratedCode`; generated entries now appear and navigate to their field or annotation. Adds a real-JDT LS regression test (manual, ignored by default).

languages/java.toml

@@ -44,6 +44,7 @@ maven = { downloadSources = true, updateSnapshots = false }
 eclipse = { downloadSources = true }
 references = { includeDecompiledSources = true }
 signatureHelp = { enabled = true }
+symbols = { includeGeneratedCode = true }
 configuration = { updateBuildConfiguration = "automatic" }
 project = { referencedLibraries = ["lib/**/*.jar"] }
 # Generated code (implement methods, getters, toString…) indents like the editor (`indent` above).