chore: remove Docker and containerization configuration files

The project no longer requires containerized deployment. Removing nixpacks.toml, Dockerfile, and docker-compose.yml simplifies the repository and aligns with a shift to a different hosting or deployment strategy.

Dockerfile

@@ -1,24 +0,0 @@
-FROM node:18-alpine
-
-WORKDIR /app
-
-# Install dependencies
-COPY package*.json ./
-RUN npm install
-
-# Copy application code
-COPY . .
-
-# Create data directory
-RUN mkdir -p /app/data
-
-# Expose port
-EXPOSE 5000
-
-# Healthcheck
-RUN apk add --no-cache curl
-HEALTHCHECK --interval=30s --timeout=3s \
-  CMD curl -f http://localhost:5000/ || exit 1
-
-# Start server
-CMD ["npm", "start"]