Add single container Docker setup (backend + frontend in one container)

Dockerfile

@@ -0,0 +1,68 @@
+# ═══════════════════════════════════════════════════════════════
+#  Oltalama - Single Container (Backend + Frontend)
+# ═══════════════════════════════════════════════════════════════
+
+# Stage 1: Build Frontend
+FROM node:20-alpine AS frontend-builder
+
+WORKDIR /app/frontend
+
+# Copy frontend files
+COPY frontend/package*.json ./
+RUN npm ci
+
+COPY frontend/ ./
+RUN npm run build
+
+# Stage 2: Production (Backend + Frontend)
+FROM node:20-alpine
+
+# Install tini for proper signal handling
+RUN apk add --no-cache tini
+
+# Create app user
+RUN addgroup -g 1001 -S oltalama && \
+    adduser -S -u 1001 -G oltalama oltalama
+
+WORKDIR /app
+
+# Copy backend package files
+COPY backend/package*.json ./backend/
+WORKDIR /app/backend
+
+# Install backend dependencies (production only)
+RUN if [ -f package-lock.json ]; then \
+        npm ci --omit=dev; \
+    else \
+        npm install --only=production; \
+    fi
+
+# Copy backend source
+WORKDIR /app
+COPY backend/ ./backend/
+
+# Copy frontend build from builder stage
+COPY --from=frontend-builder /app/frontend/dist ./frontend/dist
+
+# Copy entrypoint script
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
+# Create necessary directories
+RUN mkdir -p /app/backend/database /app/backend/logs && \
+    chown -R oltalama:oltalama /app
+
+# Switch to non-root user
+USER oltalama
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:3000/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Use tini as entrypoint
+ENTRYPOINT ["/sbin/tini", "--", "/usr/local/bin/docker-entrypoint.sh"]
+CMD ["node", "backend/src/app.js"]
+