Phase 10: iGPU passthrough — render/video group GID detection (0.10.0)

- gpu_service: detect host render/video group GIDs from /dev/dri node ownership
  (render node → render GID, paired card node → video GID); added to GPUInfo +
  exposed via /api/system/gpus. inject_dri now emits numeric group_add entries
  (e.g. ["991","44"]) when GIDs are known, falling back to names otherwise;
  remove_gpu strips those GIDs + LIBVA_DRIVER_NAME; dri_group_gids() for cleanup.
- editor set-gpu passes render_gid/video_gid through; GPUSelector shows detected
  GIDs, defaults video group on, and sends them.

Verified: py_compile, unit check (inject→["991","44"] then clean removal),
frontend tsc build, image imports. Live iGPU verify is on the user's hardware.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "stackpilot-frontend",
   "private": true,
-  "version": "0.9.0",
+  "version": "0.10.0",
   "type": "module",
   "scripts": {
     "dev": "vite",