feat(sdk,plugins): ajoute capability tooling et services runtime publics (workspace/terminal/tasks)

- capability manifeste tooling supportée backend + transport runtime catalog
- ctx.services publique côté SDK/runtime, gated par tooling
- surface honnête: workspace, terminal, et tasks en observation/contrôle uniquement
- docs/exemple/tests mis à jour
- QA PASS sur feature/sdk-plugin-tooling-build-debug-surface

sdk/IdeaSDK/examples/hello-plugin/idea-plugin.json

@@ -11,7 +11,8 @@
   },
   "trustLevel": "full",
   "capabilities": [
-    "ui"
+    "ui",
+    "tooling"
   ],
   "contributes": {
     "menus": [