Mod naming rule and engine UI in engine mods

Mods are renamed by role (shell2d_base, menu_base, ui_base, live2d_base,
editor_tools, cthangover_story, cthangover_murakami, cthangover_party) and
every reference follows. Engine UI prefabs (dialog, answers, message, game
menu, inventory, map, skills) and their panel entries moved out of the story
mod into the subsystem mods; the card_novel and vn_starter_novel collections
are removed.

test_suites/new_game/manifest.json

@@ -1,6 +1,6 @@
 {
   "name": "New Game Flow Test",
-  "description": "End-to-end play like a player in one process: front-end menu → Play → the cthangover card → New game → in-process mod-set switch → the prologue in prolog_alley with Marao's dialog → in-game hot reload of starter_party (session restored) → menu → card_novel → menu → cthangover again; every released mod context must be collected. Activated only by --itest=new_game (with --frontend).",
+  "description": "End-to-end play like a player in one process: front-end menu → Play → the cthangover card → New game → in-process mod-set switch → the prologue in prolog_alley with Marao's dialog → in-game hot reload of cthangover_party (session restored) → menu → novel_template → menu → cthangover again; every released mod context must be collected. Activated only by --itest=new_game (with --frontend).",
   "sources": [
     "src/*.cs"
   ]