- Change JSON field names from camelCase to snake_case as required by Gemini API
(generation_config, max_output_tokens, system_instruction)
- Improve message handling to ensure proper role alternation (user/model)
- Add safety checks for empty contents and ensure first message is always from user
- Implement robust error handling and response parsing
- Handle edge cases where candidatesTokenCount might be returned as a list
Fixes#6