feat(modules): 13 new game modules and standardization across top steam games

[ValgulNecron]

Implements Feature 015: Dedicated Server Modules for Top Steam Games.

Reference: Gameplane specs/015-top-steam-game-modules

Includes:

• 13 new game modules: fivem, team-fortress-2, farming-simulator-25, euro-truck-simulator-2, mount-and-blade-2-bannerlord, tmodloader, beammp, left-4-dead-2, the-isle, ark-survival-evolved, arma-reforger, hell-let-loose, squad
• Standardization across 13 existing modules
• Steam Workshop integration wiring for DayZ, Squad, and Arma Reforger
• Layout validation and test suites passing cleanly (0 errors)