fix: preserve string-typed params as raw strings instead of parsing as JSON

[m11y]

Problem

When a CLI parameter value looks like valid JSON (starts with { or [), ParseToJsonArrayOrObject deserializes it into a Go map/slice. The SDK's volcenginequery.BuildHandler then serializes the map as flattened query params:

PolicyDocument.Statement.0.Effect=Allow&PolicyDocument.Statement.0.Action.0=volcSMS:SendSms&...

This breaks APIs that expect the parameter to be a raw JSON string, such as IAM CreatePolicy's PolicyDocument:

# Always fails with "InvalidPolicy.Structure: Document is not a valid JSON string."
ve iam CreatePolicy --PolicyName MyPolicy --PolicyDocument '{"Statement":[{"Effect":"Allow","Action":["tos:*"],"Resource":["*"]}]}'

Root Cause

In cmd_action.go, the parameter parsing loop unconditionally attempts JSON deserialization on all non-body flag values (line 103). There is no check for whether the API actually expects a structured object or a plain string.

Fix

Use the existing API metadata (metatype) to look up each parameter's declared type. If the type is "string", skip ParseToJsonArrayOrObject and pass the value as-is. This is a minimal, targeted fix:

• Added GetApiMeta() to RootSupport to expose per-action type metadata
• Added isStringParam() helper that checks if a parameter is declared as "string" type
• Modified the doAction parameter loop to skip JSON parsing for string-typed params
• Added unit tests for isStringParam

Parameters without type metadata (i.e., ApiMeta is nil) retain the existing behavior — JSON parsing is still attempted as a best-effort heuristic.

Test Plan

• go build ./... passes
• Unit tests for isStringParam pass
• Manual test: ve iam CreatePolicy --PolicyDocument '{"Statement":[...]}' should succeed

[m11y]

Hey @xuyaming0800, hope youre doing well!

I submitted this PR a while ago and just wanted to gently check in to see if youve had a chance to take a look. No rush at all — I know everyone has a lot on their plate.

Happy to make any changes or clarifications if needed. Thanks so much for your time and for maintaining this project!

[m11y]

Hey @xuyaming0800, hope you're doing well!

I submitted this PR a while ago and just wanted to gently check in to see if you've had a chance to take a look. No rush at all — I know everyone has a lot on their plate.

Happy to make any changes or clarifications if needed. Thanks so much for your time and for maintaining this project!