Delete DirectPKGInstaller and the toolbox DPI toggle. Remove the custom
background package installer (custompkginstaller XML generation and
id_pkg_ handlers). Package install remains the stock PkgInstaller link
in OrionHEN_toolbox.xml. Leave BREW_UTIL_UNUSED_DPI ordinal for IPC
compatibility.
Add suites for liborion_platform (fs/log/notify), richer settings and ready
flag cases, and msg.hpp protocol ordinals. Link real platform sources under
ORION_HOST_TEST; fix DaemonCommands to unsigned so high-bit opcodes are
well-formed. Rename host binary to orion-host-tests.