After the DensePoseHead startup fix (#910), the v1 API starts, but the
Performance Tests load-hit the pose endpoints which error "requires real
CSI data" (no hardware in CI, mock_pose_data defaults False), and the
API-docs job imports the app the same way. Set MOCK_POSE_DATA=true on both
jobs so they exercise the mock path. Verified: the env var maps to
settings.mock_pose_data=True (pydantic, no env_prefix).
(Note: Performance Tests is continue-on-error so this is cleanup, not a
run-blocker; the run-level red on main has been transient Docker Hub pull
timeouts on Tests/docker-build, which are infra flakes that pass on re-run.)
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