feat(cli): group model selector by provider with search

Replace the flat numbered model list with provider-grouped browsing
(combos first, then providers by alias order), full-text search across
all models, and manual custom model ID entry. A single available
category opens directly into its model list.

Also bump root and cli packages to 0.5.75 and ignore packed
`9router-*` tarballs.

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

cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "9router",
-  "version": "0.5.69",
+  "version": "0.5.75",
   "description": "9Router CLI - Start and manage 9Router server",
   "bin": {
     "9router": "./cli.js"