build ant/term ↗

Add compile-time config: font, theme (suckless config.h style) Rather than a parsed config file, user_config in config.odin is a plain Odin value edited and rebuilt in place — no parser, no runtime file I/O, keeping with the stateless-is-safer principle. Refactors render's palette globals into an explicit Theme struct passed through draw() so config can actually reach it. Drops $TERM_FONT_PATH now that font path lives in config.odin; the packaged Nix build patches the compiled-in default via substituteInPlace instead of wrapping the binary. Keybinding remapping is deferred until there's a real action to bind.