feat: Last Prompt shows full prompt with evil mode awareness

- discord_bridge before_agent_starts now checks evil_mode from
  working_memory to load the correct personality files:
  Normal: miku_lore/prompt/lyrics + /app/moods/{mood}.txt
  Evil: evil_miku_lore/prompt/lyrics + /app/moods/evil/{mood}.txt
- Reads files directly instead of relying on cross-plugin working_memory
- cat_client.query() returns (response, full_prompt) tuple
- Full prompt includes system prefix + recalled memories + conversation
- API /prompt/cat returns full_prompt field

bot/globals.py

@@ -85,7 +85,7 @@ LAST_FULL_PROMPT = ""
 
 # Cheshire Cat last interaction tracking (for Web UI Last Prompt toggle)
 LAST_CAT_INTERACTION = {
-    "prompt": "",
+    "full_prompt": "",
     "response": "",
     "user": "",
     "mood": "",