ci(v1-api): run Performance Tests + API Docs with MOCK_POSE_DATA=true

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.)

.github/workflows/ci.yml

@@ -269,6 +269,10 @@ jobs:
 
     - name: Start application
       working-directory: archive/v1
+      env:
+        # No CSI hardware in CI — serve mock pose data so the pose endpoints
+        # respond 200 under load instead of erroring "requires real CSI data".
+        MOCK_POSE_DATA: "true"
       run: |
         uvicorn src.api.main:app --host 0.0.0.0 --port 8000 &
         sleep 10
@@ -384,6 +388,8 @@ jobs:
 
     - name: Generate OpenAPI spec
       working-directory: archive/v1
+      env:
+        MOCK_POSE_DATA: "true"   # no CSI hardware in CI
       run: |
         python -c "
         from src.api.main import app