fix(tools): support local file upload in upload_asset tool

[Aniruddha Ganesh (Aniganesh)]

Summary

Add support for uploading local files in the upload_asset tool.

Description

This PR updates the upload_asset tool to correctly handle local file uploads.

Previously, the tool simply passed the upload parameter directly to Contentful's file.upload field, which strictly requires a publicly accessible http/https URL. This caused validation errors when agents like CC attempted to upload local files.

The changes include:

• Detection of local file paths (paths starting with file:// or non-http strings).
• Reading the file content from the local filesystem.
• Uploading the binary data to Contentful's intermediate /uploads API.
• Creating the final Asset using the uploadFrom property to link to the uploaded binary, instead of the upload property.

Motivation and Context

Was trying to use this MCP with Claude code (CC) and encountered issues uploading assets, as the tool expected a file hosted on a https:// URL while I was providing a local image path. This change enables the tool to seamlesssly handle file inputs from the local filesystem.

PR Checklist

• I have read the CONTRIBUTING.md file
• All commits follow conventional commits
• Documentation is updated (if necessary)
• PR doesn't contain any sensitive information
• There are no breaking changes

[wiz-inc-38d59fb8d7]

Wiz Scan Summary

Scanner	Findings
Vulnerabilities	-
Sensitive Data	-
Secrets	-
IaC Misconfigurations	-
SAST Findings	1
Software Management Findings	-
Total	1

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