fix: Update model path in TetoCog for Vertex AI content generation

cogs/teto_cog.py

@@ -401,7 +401,7 @@ class TetoCog(commands.Cog):
             try:
                 print(f"[TETO DEBUG] Sending to Vertex AI. Model: {self._ai_model}, Tool Config: {vertex_tools is not None}")
                 response = await self.genai_client.aio.models.generate_content(
-                    model=f"models/{self._ai_model}", # Use simpler model path
+                    model=f"publishers/google/models/{self._ai_model}", # Use simpler model path
                     contents=final_contents_for_api,
                     config=generation_config_with_system, # Pass the updated config
                 )