Enhance ComboHandler and orchestrator functionality with access control and error handling improvements

- Added AccessControl to ComboHandler for role-based access management.
- Implemented gas estimation for plan execution and improved gas limit checks.
- Updated execution and preparation methods to enforce step count limits and role restrictions.
- Enhanced error handling in orchestrator API endpoints with AppError for better validation feedback.
- Integrated request timeout middleware for improved request management.
- Updated Swagger documentation to reflect new API structure and parameters.

orchestrator/src/services/performance.ts

@@ -0,0 +1,48 @@
+import { cacheGet, cacheSet } from "./cache";
+import { getPlanById } from "../db/plans";
+
+/**
+ * Performance optimization utilities
+ */
+
+/**
+ * Get plan with caching
+ */
+export async function getPlanWithCache(planId: string) {
+  const cacheKey = `plan:${planId}`;
+  
+  // Try cache first
+  const cached = await cacheGet(cacheKey);
+  if (cached) {
+    return cached;
+  }
+
+  // Get from database
+  const plan = await getPlanById(planId);
+  
+  // Cache for 5 minutes
+  if (plan) {
+    await cacheSet(cacheKey, plan, 300);
+  }
+
+  return plan;
+}
+
+/**
+ * Batch API calls
+ */
+export async function batchApiCalls<T>(
+  calls: Array<() => Promise<T>>,
+  batchSize = 10
+): Promise<T[]> {
+  const results: T[] = [];
+
+  for (let i = 0; i < calls.length; i += batchSize) {
+    const batch = calls.slice(i, i + batchSize);
+    const batchResults = await Promise.all(batch.map((call) => call()));
+    results.push(...batchResults);
+  }
+
+  return results;
+}
+