address PR review

Author: SamSaffron

app/models/ai_api_audit_log.rb

@@ -13,6 +13,7 @@ module Provider
     Cohere = 6
     Ollama = 7
     SambaNova = 8
+    Mistral = 9
   end
 
   def next_log_id

lib/completions/endpoints/mistral.rb

@@ -7,6 +7,10 @@ class Mistral < OpenAi
         def self.can_contact?(model_provider)
           model_provider == "mistral"
         end
+
+        def provider_id
+          AiApiAuditLog::Provider::Mistral
+        end
       end
     end
   end