chore: remove leftover Redis infrastructure code

Dokploy stopped using Redis in v0.29.9 when the deployment queue moved
to an in-memory implementation, and install.sh no longer creates the
dokploy-redis service. Remove the remaining references so fresh installs
don't report Redis as unhealthy:

- checkRedisHealth from infrastructure health check
- cleanRedis/reloadRedis endpoints and their UI actions
- initializeRedis dev setup and redis-connection config
- unused bullmq dependency

pnpm-lock.yaml

@@ -232,9 +232,6 @@ importers:
       boxen:
         specifier: ^7.1.1
         version: 7.1.1
-      bullmq:
-        specifier: 5.67.3
-        version: 5.67.3
       class-variance-authority:
         specifier: ^0.7.1
         version: 0.7.1