fix: regenerate oapi.go to include two-tier cache fields

[hiroTamada]

Summary

• Regenerates lib/oapi/oapi.go from openapi.yaml
• Adds missing GlobalCacheKey and IsAdminBuild fields to CreateBuildMultipartBody

The generated code was not updated when the two-tier cache feature was merged, causing API requests with these fields to fail validation.

Test plan

• Verify build passes
• Test creating a build with is_admin_build and global_cache_key fields

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Note

Low Risk
Generated OpenAPI client/server types were updated to accept new request fields; risk is low but could affect API validation/serialization for CreateBuild requests if regenerated spec diverges from backend expectations.

Overview
Regenerates lib/oapi/oapi.go from the OpenAPI spec, updating the embedded swaggerSpec blob.

Adds GlobalCacheKey and IsAdminBuild to CreateBuildMultipartBody so multipart CreateBuild requests can include two-tier/global cache parameters and pass request validation.

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