Completely remove category probabilities from UI and fix MongoDB connection string support

ml-service/requirements.txt

@@ -34,7 +34,8 @@ emoji>=2.9.0
 
 # --- Database (async MongoDB for feedback) ---
 motor>=3.3.2
-pymongo>=4.6.1
+pymongo[srv]>=4.6.1
+dnspython>=2.0.0
 
 # --- Monitoring ---
 prometheus-fastapi-instrumentator>=6.1.0

python-frontend/app.py

@@ -382,11 +382,6 @@ for idx, msg in enumerate(st.session_state.messages):
             <div style="font-size:0.95rem; color:#fca5a5; margin-bottom:14px;">
                 ⚠️ <span style="text-decoration:line-through; opacity:0.7;">{msg['content']}</span>
             </div>
-            <div style="font-size:0.78rem; color:#9ca3af; margin-bottom:6px; font-weight:500;">
-                CATEGORY PROBABILITIES
-            </div>
-            {render_categories(mod.get('categories', dict()))}
-
         </div>
         """, unsafe_allow_html=True)