refactor: simplify Docker and CI/CD to use unified config

- Replace symlinked Dockerfile with simplified version in root
- Reduce Docker build args (unified config provides defaults)
- Update CI/CD workflows to use minimal build arguments
- Add nginx.conf to root directory (replace docker/nginx.conf)
- Remove docker-bake references from CI/CD workflows
- Focus on essential runtime overrides only
- Let unified config handle smart defaults

Dockerfile

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-docker/Dockerfile

Dockerfile

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+# Multi-stage Dockerfile for Medication Reminder App
+FROM node:20-slim AS base
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+  curl \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install Bun
+RUN curl -fsSL https://bun.sh/install | bash
+ENV PATH="/root/.bun/bin:$PATH"
+
+# Set working directory
+WORKDIR /app
+
+# Create non-root user
+RUN groupadd --gid 1001 nodeuser && \
+  useradd --uid 1001 --gid nodeuser --shell /bin/bash --create-home nodeuser
+
+# Builder stage
+FROM base AS builder
+
+# Copy package files
+COPY --chown=nodeuser:nodeuser package.json bun.lock* ./
+
+# Install dependencies
+RUN bun install --frozen-lockfile
+
+# Copy source code
+COPY --chown=nodeuser:nodeuser . ./
+
+# Build arguments for environment configuration
+# Build Environment - unified config will handle the rest
+ARG NODE_ENV=production
+
+# Only essential runtime variables that override unified config defaults
+ARG VITE_COUCHDB_URL
+ARG VITE_COUCHDB_USER
+ARG VITE_COUCHDB_PASSWORD
+
+# Set environment variables for build process
+# Unified config handles defaults, only set essential runtime overrides
+ENV NODE_ENV=$NODE_ENV
+ENV VITE_COUCHDB_URL=$VITE_COUCHDB_URL
+ENV VITE_COUCHDB_USER=$VITE_COUCHDB_USER
+ENV VITE_COUCHDB_PASSWORD=$VITE_COUCHDB_PASSWORD
+ENV NODE_ENV=$NODE_ENV
+
+# Build the application
+RUN bun run build
+
+# Production stage
+FROM nginx:alpine AS production
+
+# Install curl for health checks
+RUN apk add --no-cache curl
+
+# Copy built files from builder stage
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copy nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Set proper permissions for nginx
+RUN chown -R nginx:nginx /usr/share/nginx/html && \
+  chown -R nginx:nginx /var/cache/nginx && \
+  chown -R nginx:nginx /var/log/nginx && \
+  chown -R nginx:nginx /etc/nginx/conf.d
+
+# Switch to nginx user
+USER nginx
+
+# Expose port
+EXPOSE 80
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD curl -f http://localhost/health || exit 1
+
+# Start nginx
+CMD ["nginx", "-g", "daemon off;"]