add(docs): update docs for cache clean

docs/docs/features/load-unload.md

@@ -75,4 +75,5 @@ In case you got error while loading models. Please check for the correct model p
 | `user_prompt`      | String  | The prompt to use for the user.                              |
 | `ai_prompt`        | String  | The prompt to use for the AI assistant.                      |
 | `system_prompt`    | String  | The prompt for system rules.                          |
-| `pre_prompt`    | String  | The prompt to use for internal configuration.                          |
+| `pre_prompt`    | String  | The prompt to use for internal configuration.                          |
+|`clean_cache_threshold`|	Integer|	Number of chats that will trigger clean cache action.|

docs/openapi/NitroAPI.yaml

@@ -260,6 +260,11 @@ components:
           default: "ASSISTANT:"
           nullable: true
           description: The prefix for assistant prompt.
+        clean_cache_threshold:
+          type: integer
+          default: 5
+          nullable: true
+          description: Number of chats that will trigger clean cache action.
       required:
         - llama_model_path