fix: preserve external $ref URLs instead of converting to local refs

[remorses]

External $ref URLs (http/https) are now preserved as-is instead of being converted to local #/components/schemas/ references.

This allows schemas to reference external JSON Schema definitions for editor autocomplete while keeping the OpenAPI spec valid.

Example: $ref: "https://models.dev/model-schema.json#/$defs/Model" is now preserved instead of being converted to $ref: "#/components/schemas/Model".

cc @MathurAditya724

Blocked PR: anomalyco/opencode#12112

[Copilot]

Pull request overview

This PR fixes the handling of external $ref URLs in schema conversions. Previously, all $ref values were converted to local OpenAPI component references (#/components/schemas/...), but now external URLs (http/https) are preserved as-is.

Changes:

• Modified convertToOpenAPISchema to detect and preserve external $ref URLs instead of converting them to local component references
• Added test case for external $ref URL preservation with Zod v4
• Updated snapshot to reflect the new behavior where external URLs are kept intact

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/vendors/convert.ts	Added logic to detect http/https URLs in $ref and preserve them instead of converting to local component refs
tests/zod_v4.test.ts	Added test case verifying external $ref URLs are preserved
tests/snapshots/zod_v4.test.ts.snap	Snapshot showing external URL is preserved alongside original schema properties

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commit: 0e62974

[remorses]

thanks!