[game] Initialize skill icons for context actions

[Eldbury]

Summary

Initializes the skills service during game module setup so skill-backed context actions can resolve their icons.

This fixes missing/invisible icons for context actions such as Security while preserving the existing action eligibility rules.

Testing

• Built engine and launcher in RelWithDebInfo on Windows
• Ran git diff --check upstream/master...HEAD
• Verified branch diff only includes:
  • src/libs/game/di/module.cpp

Manual verification

• K1 Endar Spire: Trask's Security context action appears with a visible icon
• K1 Dantooine: Security icon appears only for party members with Security
• Unlocked doors still show normal interaction, not Security

[modawan]

Good catch! We had similar problems with spells and feats, so we should really check that all services are initialized.