Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### Summary As title. --------- Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### Summary Merge HTTP response functions into common/response.go --------- Signed-off-by: Jin Hai <haijin.chn@gmail.com>
## Summary - Align Langfuse API key set/get/delete behavior with the Python implementation. - Improve DAO handling for Langfuse credential save/delete flows. - Add tests for Langfuse service error handling and API key lifecycle behavior.
