caciarabot Phase 3: admin commands and reply fixes

caciarabot grew a Phase 3 admin surface: /sleep, /wake, /categories, /stats, and /reload let moderators pause the bot, inspect its categories, and reload state without touching the container. Two reply bugs were also fixed — a cited reply and a word-trigger image can now fire together, and the LLM prompt no longer drifts into recurring ants/insects imagery.