Fix POST JSON parameter determination logic (goctl api swagger) & Add some unit test.

[Twilikiss]

1.Comparison before and after correction

• Before correction:

• After correction

2. Unit Test Description

2.1 PostJson Testing (TestIsPostJson)

• Verify the correct identification of the POST method and JSON tags

• Key test: Non-POST methods should not return true (bug fixed before)

2.2 Parameter Generation Test (TestParameters from Type)

• Test the key parameter generation scenarios

• Verify the correct generation of the body parameter

2.3 Boundary Condition Test (TestParameters from type _edgecases)

• Test the handling of nil and non-struct types

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.89%. Comparing base (8690859) to head (16500b1).
Report is 377 commits behind head on master.

Additional details and impacted files

see 21 files with indirect coverage changes

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