fix: Resolve Gradio client FileData validation error

- Use handle_file() to create proper FileData objects for Gradio API calls
- Fixes "meta field must be explicitly provided" validation error
- Ensures Gradio client passes correctly formatted file metadata

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

Co-Authored-By: Claude <noreply@anthropic.com>

core/mcp_audio_handler.py

@@ -600,8 +600,12 @@ class MCPAudioHandler:
                     try:
                         print(f"🎤 HTTP STT: Trying Gradio endpoint: {endpoint}")
                         
+                        # Create proper FileData object for Gradio client
+                        from gradio_client import handle_file
+                        file_data = handle_file(audio_file_path)
+                        
                         result = client.predict(
-                            audio_file_path,           # audio file
+                            file_data,                # audio file as FileData object
                             "auto",                   # language  
                             "base",                   # model_size
                             True,                     # return_timestamps

version.py

@@ -2,8 +2,8 @@
 Version information for ChatCal Voice-Enabled AI Assistant
 """
 
-__version__ = "0.8.0"
-__build_date__ = "2025-08-23T03:15:00"
+__version__ = "0.8.1"
+__build_date__ = "2025-08-23T04:00:00"
 __description__ = "VoiceCal - Voice-Enabled AI Scheduling Assistant with Whisper corruption detection and alternative STT models"
 
 def get_version_info():