Refactor Xenon hot spots

[chrisnestrud]

Plan to split refactors into focused PRs to address Xenon complexity findings and cleanup tasks.

Planned PRs:

• Server core refactors (server startup/login/stats, bind IP/config, virtual bots, localization cache)
• Server game logic refactors (game bots, game utils mixins, scoring logic)
• Test-only refactor (Midnight human/bot test flow)
• Client refactors (network manager + UI improvements)

PRs:

• Refactor server core and bind IP config #135
• Refactor server game logic and bot AI #136
• Refactor midnight human/bot test #137
• Refactor client UI and networking #138

Each PR references this issue and includes scoped tests.