perf(translator): pre-allocate map capacity in hot paths

Add capacity hints to maps where input size is known:
- effectiveBackendServices: shadowByName + shadowByOriginal with len(services)
- loadPartialBackends: loadedKeys with len(serviceKeys)

Reduces map rehashing and heap allocations during translation.

Author: mahmut-Abi

internal/translator/mesh.go

@@ -72,8 +72,8 @@ func translateMeshServiceListeners(frontends []mesh.ServiceFrontendPort) []ir.Li
 }
 
 func effectiveBackendServices(services []corev1.Service) []backendService {
-	shadowByName := make(map[string]corev1.Service)
-	shadowByOriginal := make(map[string]corev1.Service)
+	shadowByName := make(map[string]corev1.Service, len(services))
+	shadowByOriginal := make(map[string]corev1.Service, len(services))
 	for _, service := range services {
 		if service.Labels[mesh.ShadowServiceRoleLabel] != mesh.ShadowServiceRoleValue {
 			continue

internal/translator/partial_backends.go

@@ -225,7 +225,7 @@ func expandMeshShadowBackendKeys(
 
 	expandedServiceKeys := cloneObjectKeyMap(serviceKeys)
 	expandedReplacementKeys := cloneObjectKeyMap(replacementKeys)
-	loadedKeys := make(map[string]struct{})
+	loadedKeys := make(map[string]struct{}, len(serviceKeys))
 	pendingKeys := cloneObjectKeyMap(serviceKeys)
 
 	for len(pendingKeys) != 0 {