Add Dockerfile and gitignore

Dockerfile

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+FROM node:18-alpine
+
+WORKDIR /app
+
+# Install dependencies for sharp
+RUN apk add --no-cache \
+    g++ \
+    make \
+    python3
+
+# Copy package files and install dependencies
+COPY package*.json ./
+RUN npm install
+
+# Copy source code
+COPY . .
+
+# Build TypeScript code
+RUN npm run build
+
+# Default environment variables
+ENV NODE_ENV=production
+
+# The API key should be passed at runtime
+# ENV OPENROUTER_API_KEY=your-api-key-here
+# ENV OPENROUTER_DEFAULT_MODEL=your-default-model
+
+# Run the server
+CMD ["node", "dist/index.js"]