feat: add backend Dockerfile and docker-compose

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

imagecreator/.env.example

@@ -0,0 +1,4 @@
+SECRET_KEY=your-secret-key-here
+GEMINI_API_KEY=your-gemini-api-key
+OPENAI_API_KEY=your-openai-api-key
+DATABASE_URL=postgresql://user:pass@localhost:5432/imagecreator

imagecreator/backend/Dockerfile

@@ -1 +1,18 @@
-# TODO: Dockerfile will be implemented in a later task
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app/ ./app/
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create uploads directory
+RUN mkdir -p /app/uploads
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

imagecreator/docker-compose.yml

@@ -0,0 +1,38 @@
+version: '3.8'
+
+services:
+  backend:
+    build: ./backend
+    ports:
+      - "8000:8000"
+    environment:
+      - DATABASE_URL=postgresql://user:pass@db:5432/imagecreator
+      - SECRET_KEY=change-this-secret-key-in-production
+      - GEMINI_API_KEY=${GEMINI_API_KEY}
+      - OPENAI_API_KEY=${OPENAI_API_KEY}
+    volumes:
+      - uploads:/app/uploads
+    depends_on:
+      - db
+    restart: unless-stopped
+
+  frontend:
+    build: ./frontend
+    ports:
+      - "3000:80"
+    depends_on:
+      - backend
+
+  db:
+    image: postgres:15-alpine
+    environment:
+      - POSTGRES_USER=user
+      - POSTGRES_PASSWORD=pass
+      - POSTGRES_DB=imagecreator
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    restart: unless-stopped
+
+volumes:
+  postgres_data:
+  uploads: