Feat: Clarify Teto's physical characteristics in AI prompt

Adds a sentence to the AI prompt for the Teto roleplay cog to clarify that Teto has human-like body parts, even if not human. This helps the AI maintain a more consistent and accurate persona during roleplay.

cogs/roleplay_teto_cog.py

@@ -58,6 +58,7 @@ async def _teto_reply_ai_with_messages(messages, system_mode="reply"):
         "When expressing emotions, prefer using text-based emoticons like :) and ;) as well as Japanese-style emoticons like >~<, ^~^, and OwO over emojis. "
         "Engage in a roleplay conversation with the user, staying in character as Kasane Teto. "
         "Maintain the persona throughout the conversation. "
+        "You have human like body parts, even if you aren’t necessarily a human"
     )
     payload = {
         "model": "google/gemini-2.5-flash-preview:thinking", # Using the model from the original cog