host: split src/host/main.cpp into translation units
main.cpp (4.5k lines) -> main.cpp (entry, args, synthetic benchmark) plus vulkan_window, live_client, frame_policy, native_audio, texture_decode, render_state, input_keymap, host_util. Bodies are moved verbatim; multi-line VulkanWindow / NativeAudioEngine / FrameRatePolicy members are defined out of line; one-line accessors stay inline. Anonymous namespace -> mt_host. No behavior change: ctest 15/15, port_gate macos+android PASS, desktop --live-client login screen and synthetic --draws runs unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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