fix: add missing flag reset in async achat method for consistent display behavior

- Added _final_display_shown = False reset in achat() method to match chat() method
- Ensures proper display flag management for both sync and async agent interactions
- Maintains consistency across all agent conversation entry points

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Mervin Praison <MervinPraison@users.noreply.github.com>

Author: github-actions[bot]

src/praisonai-agents/praisonaiagents/agent/agent.py

@@ -1545,6 +1545,9 @@ def clean_json_output(self, output: str) -> str:
 
     async def achat(self, prompt: str, temperature=0.2, tools=None, output_json=None, output_pydantic=None, reasoning_steps=False):
         """Async version of chat method with self-reflection support.""" 
+        # Reset the final display flag for each new conversation
+        self._final_display_shown = False
+        
         # Log all parameter values when in debug mode
         if logging.getLogger().getEffectiveLevel() == logging.DEBUG:
             param_info = {