fix(ci): B5 整合測試改用 compose pytest-runner service

問題: runner 是 Docker-in-Docker，-v /opt/api-venv 掛到 host 路徑不存在

修正:
- docker-compose.test.yml: 新增 pytest-runner service (python:3.11-slim)
  在 compose 網路內跑，hostname=postgres-test 直連，自裝 deps
- postgres-test: initdb.d 自動執行 setup_test_schema.sql，省去手動 psql
- cd.yaml: 改用 --profile test + --exit-code-from pytest-runner

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/docker-compose.test.yml

@@ -17,6 +17,9 @@ services:
       POSTGRES_PASSWORD: awoooi_test_2026
     ports:
       - "15432:5432"
+    # 啟動時自動執行 setup_test_schema.sql (initdb.d 機制)
+    volumes:
+      - ./tests/integration/setup_test_schema.sql:/docker-entrypoint-initdb.d/01-schema.sql:ro
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U awoooi -d awoooi_test"]
       interval: 5s
@@ -34,3 +37,24 @@ services:
       interval: 5s
       timeout: 3s
       retries: 5
+
+  # 2026-04-10 Claude Sonnet 4.6 Asia/Taipei: 整合測試 runner
+  # 在 compose 網路內跑 pytest，hostname=postgres-test 直連，不依賴 host venv
+  pytest-runner:
+    image: python:3.11-slim
+    working_dir: /workspace
+    volumes:
+      - .:/workspace
+    environment:
+      TEST_DATABASE_URL: "postgresql+asyncpg://awoooi:awoooi_test_2026@postgres-test:5432/awoooi_test?ssl=disable"
+    depends_on:
+      postgres-test:
+        condition: service_healthy
+      redis-test:
+        condition: service_healthy
+    command: >
+      sh -c "pip install -q uv &&
+             uv pip install -q --system -e '.[dev]' &&
+             pytest tests/integration/test_b5_core_flows.py -v --tb=short"
+    profiles:
+      - test  # 只在明確指定 --profile test 時才啟動