When generating a curl command line, use -d to carry form data

[kkHAIKE]

curl's -F option generates multipart/form-data requests

And optimized curl data parsing to support multiple data parameters

[Copilot]

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/posting/importing/curl.py:115

• [nitpick] The flag 'is_multipart_data' is introduced but is not used in subsequent logic. Consider either integrating its usage or removing it if it serves no purpose.

self.is_multipart_data = False

src/posting/importing/curl.py:138

• Ensure that all collected data arguments, including --data-urlencode, are correctly flattened. Consider edge cases where an empty value or list might affect the final join operation.

args.data_urlencode,

[darrenburns]

Thanks again :)