Move Common Commands to docs/COMMANDS.md and add docs/CONVENTIONS.md for frontend patterns (SWR, filters, Mantine, routing, API URLs). CLAUDE.md now only contains runtime rules and pointers.
Move Common Commands to docs/COMMANDS.md and add docs/CONVENTIONS.md for frontend patterns (SWR, filters, Mantine, routing, API URLs). CLAUDE.md now only contains runtime rules and pointers.