Split visualizer into example/ sub-project
- Move renderer.h/cpp and ui_renderer.h/cpp to example/src/
- Move main.cpp to example/src/
- Move raylib and raygui submodules to example/ext/
- Keep tomlc17 submodule at root (library-only dependency)
- Root Makefile builds liborbit.a static library + tests
- example/Makefile builds orbit_sim, links liborbit.a
- All build artifacts go to ./build/ via recursive BUILD_DIR
- Remove example/tests/ (sim configs run from project root)
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