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.

manifest.json

@@ -1,6 +1,6 @@
 {
-  "id": "base_menu",
-  "name": "Base Menu",
+  "id": "menu_base",
+  "name": "Menu",
   "version": "1.0.0",
   "author": "ct",
   "description": "Registry-driven main menu: built-in buttons, settings and save/load panels moved out of the core.",
@@ -8,7 +8,7 @@
   "sources": [
     "src/**/*.cs"
   ],
-  "depends": ["interface>=1"],
+  "depends": ["ui_base>=1"],
   "test_suites": [
     {"id": "menu_flow", "activate": ["--itest=menu_flow"]},
     {"id": "save_dormancy", "activate": ["--itest=save_dormancy"]},