feat: Add Docker containerization, production serving, and Gitea CI/CD workflow.

Dockerfile

@@ -0,0 +1,27 @@
+# Use Node.js LTS (Alpine for smaller size)
+FROM node:20-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package definition first to cache dependencies
+COPY src/package.json src/package-lock.json ./
+
+# Install dependencies
+# Using npm install instead of ci to ensure updated package.json is respected
+RUN npm install
+
+# Copy the rest of the source code
+COPY src/ ./
+
+# Build the frontend (Production build)
+RUN npm run build
+
+# Remove development dependencies to keep image small
+RUN npm prune --production
+
+# Expose the application port
+EXPOSE 3000
+
+# Start the application
+CMD ["npm", "start"]