hive: remove the read-only schedules page and the old schedule store

Scheduled prompts live at swarm level (swarm-controller's
/api/schedules, `swarmctl schedule`, the swarm UI's /schedules page).
The hive dashboard's SCH3DUL3S tab only listed the rows left in
hive-c0re's `scheduled_prompts` table so operators could copy them
over; the operator confirmed everything is migrated.

Removed:
- the SCH3DUL3S tab, its pane, schedules.js, its CSS (including the
  `.rqe-source*` rules, whose only emitter was schedules.js) and the
  hub tile's "schedules" entry
- hive-c0re's GET /api/schedules and the `scheduled_prompts` store
  (with its v1 column migration and test)
- hive-sh4re's `schedule` wire types, which only that route used
- docs describing the tab, the route and the two tables

The rebuild-queue cancel route that shared the module moves to
dashboard/rebuild_queue.rs under an OpenAPI tag of its own.

The two sqlite tables are not dropped: nothing opens them any more,
and persistence.md says they can be dropped by hand.

Closes #4916

hive-c0re/src/main.rs

@@ -45,7 +45,7 @@ mod workers;
 
 pub(crate) use agent_config::{capabilities, limits, resource_limits, tool_groups, topology};
 pub(crate) use stats::{container_stats, hive_stats, host_stats, otel_metrics, warnings};
-pub(crate) use stores::{broker, build_logs, db, power, scheduled_prompts};
+pub(crate) use stores::{broker, build_logs, db, power};
 pub(crate) use workers::{agent_sockets, auto_update, crash_watch, knowledge, mcp_sockets};
 
 use coordinator::{Coordinator, HiveEnv, ServeConfig};