Add command line interface and Docker support for text cleanup functionality

.dockerignore

@@ -0,0 +1,41 @@
+# Docker ignore file for text-cleanup
+
+node_modules
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Development files
+.git
+.gitignore
+.vercel
+.env*
+
+# Web application files (not needed in CLI Docker image)
+index.html
+script.js
+styles.css
+vercel.json
+
+# Documentation and development files
+README.md
+.vscode
+.idea
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Test files
+test/
+tests/
+*.test.js
+
+# Temporary files
+tmp/
+temp/

.gitignore

@@ -36,3 +36,7 @@ Thumbs.db
 # Temporary files
 /tmp/
 .vercel
+
+# Test files for development
+test-files/
+README.md.backup

Dockerfile

@@ -0,0 +1,29 @@
+FROM node:18-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies (if any) - use npm install since no package-lock exists
+RUN npm install --only=production
+
+# Copy source code
+COPY lib/ ./lib/
+COPY bin/ ./bin/
+
+# Make CLI executable
+RUN chmod +x bin/text-cleanup
+
+# Create a non-root user
+RUN addgroup -g 1001 -S textcleanup && \
+    adduser -S textcleanup -u 1001
+
+# Change to non-root user
+USER textcleanup
+
+# Set entrypoint to the CLI
+ENTRYPOINT ["node", "bin/text-cleanup"]
+
+# No default CMD, so it can process stdin by default