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.

orchestrator/src/api/execution.ts

@@ -0,0 +1,49 @@
+import { Request, Response } from "express";
+import { executionCoordinator } from "../services/execution";
+import { asyncHandler } from "../services/errorHandler";
+import { auditLog } from "../middleware";
+
+/**
+ * POST /api/plans/:planId/execute
+ * Execute a plan
+ */
+export const executePlan = asyncHandler(async (req: Request, res: Response) => {
+  const { planId } = req.params;
+  
+  const result = await executionCoordinator.executePlan(planId);
+  
+  res.json(result);
+});
+
+/**
+ * GET /api/plans/:planId/status
+ * Get execution status
+ */
+export const getExecutionStatus = asyncHandler(async (req: Request, res: Response) => {
+  const { planId } = req.params;
+  const executionId = req.query.executionId as string;
+  
+  if (executionId) {
+    const status = await executionCoordinator.getExecutionStatus(executionId);
+    return res.json(status);
+  }
+  
+  // Get latest execution for plan
+  res.json({ status: "pending" });
+});
+
+/**
+ * POST /api/plans/:planId/abort
+ * Abort execution
+ */
+export const abortExecution = asyncHandler(async (req: Request, res: Response) => {
+  const { planId } = req.params;
+  const executionId = req.query.executionId as string;
+  
+  if (executionId) {
+    await executionCoordinator.abortExecution(executionId, planId, "User aborted");
+  }
+  
+  res.json({ success: true });
+});
+