- Fixed GoogleProviderHandler to return OpenAI-style response format
- Added tools and tool_choice parameters to OllamaProviderHandler (accepted but ignored)
- Fixed OpenAI message building to properly handle tool messages with tool_call_id
- Fixed max_tokens handling to avoid passing null values to APIs
- Converted Ollama response to OpenAI-style format for consistency

This fixes the following errors:
- 'Cannot read properties of undefined (reading '0')' - Google response format issue
- 'OllamaProviderHandler.handle_request() got an unexpected keyword argument 'tools''
- 'for 'role:tool' the following must be satisfied[('messages.23.tool_call_id' : property 'tool_call_id' is missing)]'
- 'Invalid input: expected number, received null' for max_tokens parameter