Add a gated MODS row to the FireRed/LeafGreen start menu and an always-on
MODS row in the option menu. Both open a manager on the game3 stack that
reuses ManagerState behavior (list, detail, options, staged apply, profiles)
and draws with FRLG chrome. Nested name/quantity prompts route to the Gen 3
naming screen and a quantity dialog; APPLY & RESTART returns to the title.