refactor: enhance Evoai integration with improved validation and message handling

This commit refines the Evoai integration by updating the service and controller logic for better functionality and maintainability. Key changes include:
- Added the `openaiService` as a parameter in the EvoaiService constructor for improved dependency management.
- Enhanced the createBot method in EvoaiController to include EvoAI-specific validation and duplicate checks.
- Updated EvoaiDto and EvoaiSettingDto to remove unnecessary comments and add a fallback property.
- Refined the message processing logic in EvoaiService to handle audio messages more effectively and improve logging clarity.
- Adjusted the schema for Evoai settings to rename `evoaiIdFallback` to `botIdFallback` for better clarity.

These updates contribute to a more robust and maintainable Evoai integration.

src/api/integrations/chatbot/evoai/validate/evoai.schema.ts

@@ -71,7 +71,7 @@ export const evoaiSettingSchema: JSONSchema7 = {
     keepOpen: { type: 'boolean' },
     debounceTime: { type: 'integer' },
     ignoreJids: { type: 'array', items: { type: 'string' } },
-    evoaiIdFallback: { type: 'string' },
+    botIdFallback: { type: 'string' },
     splitMessages: { type: 'boolean' },
     timePerChar: { type: 'integer' },
   },