options UI: settle file terminology on the end-user term 'Profile' (D359)

'Game file' (the manual's term) reads, in modern PC usage, as the
program's own files, not the user's save. 'Profile' is the clearest
end-user term for what these files actually are -- a per-player
bundle of progress + per-file settings -- and '(per profile)'
expresses the tag's scope where '(save)' read as a verb.

Strings (both UIs: front options + F10 overlay):
- front top row: 'Save file' / 'File N'  ->  'Profile' / 'N'
- section annotation: '(File N)' / '(no file)'  ->  '(Profile N)' / '(none)'
- per-file row tag: '(game file)'  ->  '(per profile)'
- F10 unavailable value: 'Select game file'  ->  'Select a profile'

Display layer only: identifiers and ini keys (Bond.* rows,
watchSettings*, ini) are untouched. D357 plan section 4 is the
terminology record; new D359 finding + index row; manual
'game file' -> 'profile' sync noted as a TODO (port-owned doc,
not in this repo). Build + headless smoke clean.

docs/dev/findings-index.csv

@@ -235,3 +235,4 @@ D354,FIXED,Front-end F10 Bond rows silently disabled:,"FIXED (port-only, port/sr
 D355,FIXED,F10/options Music slider inaudible in-stage:,"FIXED (port-only, port/src/watchsettings.c):"
 D356,FIXED,"Settings regroup: Turok-style pages renamed to functional sections (INPUT/GAMEPLAY/GRAPHICS/AUDIO/VIDEO) with PD-style ""(File N)"" scoping annotations, the redu…","FIXED (port-only, port/src/optionsoverlay.{h,c} + port/src/watchsettings.{h,c} + port/src/frontoptions.c; plan docs/dev/D356-SETTINGS-REGROUP-PLAN.md):"
 D358,FIXED,D356 level-1 overlap:,"FIXED (port-only, port/src/frontoptions.c):"
+D359,PARTIAL,"Settings UI file terminology settled on the end-user term ""Profile"":","LANDED (port-only, frontoptions.c + optionsoverlay.c + comments):"