Fix slow header, rebrand OAuth page, fix alpha-hub login callback

- Replace slow system_profiler/docker info with fast cached alternatives
- Single-line system info: cores · ram · docker
- Patch Pi OAuth callback page with Feynman branding
- Fix alpha-hub login: wait for server ready before opening browser, handle port conflicts, auto-close tab

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@companion-ai/feynman",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@companion-ai/feynman",
-      "version": "0.2.2",
+      "version": "0.2.3",
       "hasInstallScript": true,
       "dependencies": {
         "@companion-ai/alpha-hub": "^0.1.2",