Refactor: split monolithic main.c into a unity build
main.c was a single 6018-line translation unit. Cut it at the existing section banners into ordered part files (state, draw, config, net, jpeg, api, thumbs, display, ui, video, sync, app) that main.c #includes in dependency order. The parts form one translation unit and share all file-scope state, so there are no headers, no extern decls, and no de-static-ing of the ~100 shared globals coupling the three threads. Only src/main.c is compiled (CMakeLists unchanged). The slices are byte-exact: the preprocessed TU is identical to the old main.c, so the binary is unchanged. Verified by a clean build plus a Vita3K run (login, paging, grid, detail view, back nav, no crash). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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