Adds bbctrl.Hooks: a small dispatch layer for HOOK:<event>:<data>
messages embedded in g-code as (MSG,HOOK:droptool:) etc. Hooks can
block the unpause until the registered callback completes and
auto-resume after.
- bbctrl.Hooks: registry, fire, dispatch_hook_message, persistent
config in hooks.json, REST surface (/api/hooks, /api/hooks/save,
/api/hooks/status, /api/hooks/fire/<event>).
- Ctrl: instantiate self.hooks alongside the other subsystems.
- Planner._add_message: when a (MSG,...) line is HOOK:<event>:<data>,
route it through ctrl.hooks instead of state.messages so it never
surfaces as a UI popup and dispatch is immediate (state.messages
has a 250ms debounce).
- Web: handlers for the /api/hooks routes.
