fix: Remove misleading '(locked)' text from temperature display

- Changed 'Temperature: X (locked)' to 'Default Temperature: X'
- Temperature is user-adjustable via Advanced Settings slider
- '(locked)' was confusing users into thinking it was fixed

app.py

@@ -423,7 +423,7 @@ def get_model_info(model_key: str) -> Tuple[str, str, float, int]:
         f"(capped at {usable_ctx:,} for performance)\n"
         f"- Repo: `{m['repo_id']}`\n"
         f"- Quant: `{m['filename']}`\n"
-        f"- Temperature: {settings['temperature']} (locked)\n"
+        f"- Default Temperature: {settings['temperature']}\n"
         f"- Top P: {settings['top_p']}, Top K: {settings['top_k']}"
     )