Fix Google Photos raw upload endpoint

[saga-agent]

Summary

• send generated Google Photos raw uploads to /v1/uploads instead of the invalid /uploads path
• add a focused regression test for the generated OpenAPI path and server
• add a patch changeset for @executor-js/plugin-openapi

Verification

• bun x vitest run src/providers/google/discovery.test.ts (10 passed)
• bun run typecheck
• bunx oxfmt --check packages/plugins/openapi/src/providers/google/discovery.ts packages/plugins/openapi/src/providers/google/discovery.test.ts .changeset/fix-google-photos-upload-path.md
• independent review passed with no security or blocking logic findings