fix(java): list JDT .classpath libraries and the JDK for manifest-less projects (#2300) (#2304)

* fix(java): list JDT .classpath libraries and the JDK for manifest-less projects (#2300)

External Libraries was empty for a pure-Java project (only .classpath /
.idea/libraries, no pom.xml or build.gradle):

- jdk_groups returned early without a build manifest, so even a
  configured JDK never appeared. It now also treats .classpath, .project,
  .idea, a configured JDK and declared source roots as Java markers.
- The JDT model was never a source of libraries. classpath_groups parses
  each module's .classpath kind="lib" entries (sourcepath preferred when
  it exists) into a per-module group, discovered through the same module
  scan the other ecosystems use.

Adds quick-xml to ide-sdk (already used by ide-run / ide-host) and the
.classpath file to the External Libraries refresh triggers.

* chore: regenerate bindings for classpath library kind

src/bindings.ts

@@ -5552,7 +5552,7 @@ export type LaunchConfig = {
 export type LibraryGroup = {
 	/**  Display name, e.g. `Python 3.12 (.venv)`. */
 	name: string,
-	/**  `python` | `jdk` | `nodeModules` | `nodeCore` | `rust` | `cargo` | `go` | `goModules` | `maven` | `gradle`. */
+	/**  `python` | `jdk` | `nodeModules` | `nodeCore` | `rust` | `cargo` | `go` | `goModules` | `maven` | `gradle` | `classpath`. */
 	kind: string,
 	roots: LibraryRoot[],
 };

src/features/libraries/index.ts

@@ -29,6 +29,7 @@ const GROUP_ICONS: Record<string, string> = {
   goModules: "file-gomod",
   maven: "maven-project",
   gradle: "file-gradle",
+  classpath: "file-java",
   ruby: "file-ruby",
   gems: "file-ruby",
 };
@@ -58,6 +59,7 @@ const MANIFESTS = new Set([
   "go.mod",
   "go.sum",
   "go.work",
+  ".classpath",
   "pyproject.toml",
   "setup.py",
   "requirements.txt",