Add ECDSA signature verification and enhance ComboHandler functionality

- Integrated ECDSA for signature verification in ComboHandler.
- Updated event emissions to include additional parameters for better tracking.
- Improved gas tracking during execution of combo plans.
- Enhanced database interactions for storing and retrieving plans, including conflict resolution and status updates.
- Added new dependencies for security and database management in orchestrator.

Dockerfile

@@ -0,0 +1,39 @@
+# Multi-stage Dockerfile for orchestrator service
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY orchestrator/package*.json ./
+RUN npm ci
+
+# Copy source
+COPY orchestrator/ ./
+
+# Build
+RUN npm run build
+
+# Production stage
+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy package files
+COPY orchestrator/package*.json ./
+
+# Install production dependencies only
+RUN npm ci --only=production
+
+# Copy built files
+COPY --from=builder /app/dist ./dist
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:8080/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Start application
+CMD ["node", "dist/index.js"]
+