fix(cli): handle security: [] correctly in v3 OpenAPI importer

[tstanmay13]

Description

Linear ticket: Closes FER-8165: handle security: \[\] correctly in v3 OpenAPI importer

Handle security: [] correctly in the v3 OpenAPI importer. An explicit empty security array means "no authentication required", but the importer incorrectly set auth: true because it only checked if security != null. This caused
generated SDKs to require authentication for public endpoints.

Testing

• Unit tests added/updated
• Manual testing completed

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