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/api.py

@@ -203,10 +203,10 @@ def get_last_prompt():
 
 @app.get("/prompt/cat")
 def get_last_cat_prompt():
-    """Get the last Cheshire Cat interaction (prompt + response) for Web UI."""
+    """Get the last Cheshire Cat interaction (full prompt + response) for Web UI."""
     interaction = globals.LAST_CAT_INTERACTION
-    if not interaction.get("prompt"):
-        return {"prompt": "No Cheshire Cat interaction has occurred yet.", "response": "", "user": "", "mood": "", "timestamp": ""}
+    if not interaction.get("full_prompt"):
+        return {"full_prompt": "No Cheshire Cat interaction has occurred yet.", "response": "", "user": "", "mood": "", "timestamp": ""}
     return interaction
 
 @app.get("/mood")