feat(smart-proxy): add typed Rust config serialization and regex header contract coverage

ts/proxies/smart-proxy/utils/route-utils.ts

@@ -168,14 +168,28 @@ export function routeMatchesHeaders(
   if (!route.match?.headers || Object.keys(route.match.headers).length === 0) {
     return true; // No headers specified means it matches any headers
   }
-  
-  // Convert RegExp patterns to strings for HeaderMatcher
-  const stringHeaders: Record<string, string> = {};
-  for (const [key, value] of Object.entries(route.match.headers)) {
-    stringHeaders[key] = value instanceof RegExp ? value.source : value;
+
+  for (const [headerName, expectedValue] of Object.entries(route.match.headers)) {
+    const actualKey = Object.keys(headers).find((key) => key.toLowerCase() === headerName.toLowerCase());
+    const actualValue = actualKey ? headers[actualKey] : undefined;
+
+    if (actualValue === undefined) {
+      return false;
+    }
+
+    if (expectedValue instanceof RegExp) {
+      if (!expectedValue.test(actualValue)) {
+        return false;
+      }
+      continue;
+    }
+
+    if (!HeaderMatcher.match(expectedValue, actualValue)) {
+      return false;
+    }
   }
-  
-  return HeaderMatcher.matchAll(stringHeaders, headers);
+
+  return true;
 }
 
 /**
@@ -283,4 +297,4 @@ export function generateRouteId(route: IRouteConfig): string {
  */
 export function cloneRoute(route: IRouteConfig): IRouteConfig {
   return JSON.parse(JSON.stringify(route));
-}
+}