refactor(client): remove archetype selection, fix Randomise→Randomize

- Remove character_select.tscn and character_select.gd entirely
  (Smuggler/Detective archetypes removed per v0.2 pivot)
- New Game goes straight to character creation
- Rename Randomise→Randomize throughout (US English convention)
- Add *.import and *.uid to client gitignore (import artifacts)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/data/ui-strings.yaml

@@ -221,7 +221,7 @@ character_select:
 
 character_creation:
   btn_back: "[ESC] Back"
-  btn_randomise: "[R] Randomise"
+  btn_randomize: "[R] Randomize"
   btn_start: "[ENTER] Start"
   btn_rotate_left: "[Q] ◄"
   btn_rotate_right: "► [E]"