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>

.gitignore

@@ -88,4 +88,5 @@ graphify-out/*
 .next-analyze/*
 
 # Kiro local workspace state
-.kiro/
+.kiro/
+9router-*