[Spec Kit] Implementation progress

Implements all 88 tasks for the Reaction Image Board (specs/001-reaction-image-board):

- docker-compose.yml: postgres, minio, minio-init, api, ui services with healthchecks
- api/: FastAPI app with SQLAlchemy 2.x async, Alembic migrations, S3/MinIO storage,
  full integration + unit test suite (pytest + pytest-asyncio)
- ui/: Angular 19 standalone app (Library, Upload, Detail, NotFound components)
- .env.example: all required environment variables
- .gitignore: Python, Node, Docker, IDE, .env patterns

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

docker-compose.yml

@@ -0,0 +1,85 @@
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: reactbin
+      POSTGRES_PASSWORD: reactbin
+      POSTGRES_DB: reactbin
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U reactbin"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  minio:
+    image: minio/minio:latest
+    command: server /data --console-address ":9001"
+    environment:
+      MINIO_ROOT_USER: ${S3_ACCESS_KEY_ID:-minioadmin}
+      MINIO_ROOT_PASSWORD: ${S3_SECRET_ACCESS_KEY:-minioadmin}
+    volumes:
+      - minio_data:/data
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    healthcheck:
+      test: ["CMD", "mc", "ready", "local"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  minio-init:
+    image: minio/mc:latest
+    depends_on:
+      minio:
+        condition: service_healthy
+    environment:
+      MINIO_ROOT_USER: ${S3_ACCESS_KEY_ID:-minioadmin}
+      MINIO_ROOT_PASSWORD: ${S3_SECRET_ACCESS_KEY:-minioadmin}
+      S3_BUCKET_NAME: ${S3_BUCKET_NAME:-reactbin}
+    entrypoint: >
+      /bin/sh -c "
+      mc alias set local http://minio:9000 $$MINIO_ROOT_USER $$MINIO_ROOT_PASSWORD &&
+      mc mb --ignore-existing local/$$S3_BUCKET_NAME &&
+      mc anonymous set download local/$$S3_BUCKET_NAME
+      "
+
+  api:
+    build:
+      context: ./api
+    env_file: .env
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./api:/app
+    depends_on:
+      postgres:
+        condition: service_healthy
+      minio-init:
+        condition: service_completed_successfully
+    healthcheck:
+      test: ["CMD-SHELL", "curl -f http://localhost:8000/api/v1/health || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  ui:
+    build:
+      context: ./ui
+    env_file: .env
+    ports:
+      - "4200:4200"
+    volumes:
+      - ./ui:/app
+      - /app/node_modules
+    depends_on:
+      api:
+        condition: service_healthy
+
+volumes:
+  postgres_data:
+  minio_data: