Update server.js to load and inject helpers module

Changes:
- Add loadHelpers() function to load helpers.js via vm.Script
- Load helpers module at startup using same isolation pattern as proxy.js
- Inject helpers object into VM context for proxy.js access
- Update paths: global/ → globalVariables/, proxy.js → proxyScripts/proxy.js
- Create isolated context for helpers with crypto and console

Implementation:
- helpers.js loaded via vm.Script with isolated context
- helpers context includes crypto and console (logger)
- helpers object returned by IIFE execution
- Injected into per-request VM context alongside other globals
- Follows constitution pattern for vm.Script module loading

Testing:
- ✓ All JavaScript syntax validated
- ✓ Helpers module loads successfully
- ✓ All 11 expected functions present
- ✓ generateRequestId() returns valid format

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/server.js

@@ -27,11 +27,11 @@ const globalVMContext = {
 let globalVariableContext = {};
 
 /**
- * Load all JSON files from global/ directory and make them available as global objects
- * Pattern: global/filename.json -> globalVariableContext['filename']
+ * Load all JSON files from globalVariables/ directory and make them available as global objects
+ * Pattern: globalVariables/filename.json -> globalVariableContext['filename']
  */
 function loadGlobalObjects() {
-  const globalDir = join(__dirname, "..", "global");
+  const globalDir = join(__dirname, "globalVariables");
 
   try {
     const files = readdirSync(globalDir).filter(
@@ -68,6 +68,44 @@ function loadGlobalObjects() {
   }
 }
 
+/**
+ * Load helpers module using vm.Script
+ * Pattern: helpers.js returns object with utility functions via IIFE
+ * 
+ * @returns {Object} Helpers object with all utility functions
+ */
+function loadHelpers() {
+  const helpersPath = join(__dirname, "globalVariables", "helpers.js");
+  
+  try {
+    const helpersCode = readFileSync(helpersPath, "utf-8");
+    const helpersScript = new vm.Script(helpersCode, { filename: "helpers.js" });
+    
+    // Create isolated context for helpers (needs crypto and console)
+    const helpersContext = vm.createContext({
+      crypto,
+      console: logger,
+    });
+    
+    // Execute helpers.js and get the returned object
+    const helpers = helpersScript.runInContext(helpersContext);
+    
+    logger.info("Loaded helpers module", {
+      functions: Object.keys(helpers).length,
+      exports: Object.keys(helpers),
+    });
+    
+    return helpers;
+  } catch (error) {
+    logger.error("Failed to load helpers module", {
+      path: helpersPath,
+      error: error.message,
+      stack: error.stack,
+    });
+    throw error;
+  }
+}
+
 /**
  * Load configuration from config/default.json
  * Merges with environment variables (ENV takes precedence)
@@ -119,9 +157,12 @@ async function startServer() {
     // Load configuration into global.config
     global.config = loadConfig();
 
-    // Load global objects from global/ directory (e.g., service account keys)
+    // Load global objects from globalVariables/ directory (e.g., service account keys)
     loadGlobalObjects();
 
+    // Load helpers module via vm.Script
+    const helpers = loadHelpers();
+
     logger.info("Starting Proxy Script Server...");
     logger.info(
       `Configuration loaded: ${JSON.stringify({
@@ -135,7 +176,7 @@ async function startServer() {
     validateConfig(global.config);
     logger.info("Configuration validated successfully");
 
-    const proxyPath = join(__dirname, "proxy.js");
+    const proxyPath = join(__dirname, "proxyScripts", "proxy.js");
     const proxyCode = readFileSync(proxyPath, "utf-8");
     const script = new vm.Script(proxyCode, { filename: "proxy.js" });
 
@@ -146,6 +187,7 @@ async function startServer() {
         const context = vm.createContext({
           ...globalVMContext,
           ...globalVariableContext,
+          helpers,
           req,
           res,
         });