test: use PostgreSQL and live model integrations

compose.yaml

@@ -13,6 +13,38 @@ services:
       retries: 12
   redis:
     image: redis:7-alpine
+  test-db:
+    profiles: [test]
+    image: pgvector/pgvector:pg16
+    environment:
+      POSTGRES_DB: wisegrade_tests
+      POSTGRES_USER: wisegrade_test
+      POSTGRES_PASSWORD: wisegrade_test
+    tmpfs:
+      - /var/lib/postgresql/data
+    healthcheck:
+      test: [CMD-SHELL, "pg_isready -U wisegrade_test -d wisegrade_tests"]
+      interval: 5s
+      retries: 12
+  test:
+    profiles: [test]
+    build:
+      context: ./backend
+      args:
+        INCLUDE_DEV: "true"
+    env_file: .env
+    environment:
+      DATABASE_URL: postgresql+psycopg://wisegrade_test:wisegrade_test@test-db:5432/wisegrade_tests
+      TEST_DATABASE_URL: postgresql+psycopg://wisegrade_test:wisegrade_test@test-db:5432/wisegrade_tests
+      EMBEDDING_MODEL_PATH: /models/bge-m3
+      OCR_MODEL_DIR: /models/ocr
+    volumes:
+      - ./backend/tests:/app/tests:ro
+      - ./docs:/docs:ro
+      - ./models:/models:ro
+    depends_on:
+      test-db: {condition: service_healthy}
+    command: ["pytest", "-q"]
   api:
     build: ./backend
     env_file: .env