test: update benchmarks to use b.Loop and refactor map copying

# CHANGES

- update benchmark loops to use cleaner `b.Loop()` syntax
- remove unnecessary `b.ResetTimer()` call in token benchmark
- use `maps.Copy` for merging variables in patterns handler

internal/plugins/ai/anthropic/oauth_test.go

@@ -416,7 +416,7 @@ func TestGetValidTokenWithValidToken(t *testing.T) {
 
 // Benchmark tests
 func BenchmarkGeneratePKCE(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		_, _, err := generatePKCE()
 		if err != nil {
 			b.Fatal(err)
@@ -427,8 +427,7 @@ func BenchmarkGeneratePKCE(b *testing.B) {
 func BenchmarkTokenIsExpired(b *testing.B) {
 	token := createTestToken("access", "refresh", 3600)
 
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		token.IsExpired(5)
 	}
 }

internal/server/patterns.go

@@ -1,6 +1,7 @@
 package restapi
 
 import (
+	"maps"
 	"net/http"
 
 	"github.com/danielmiessler/fabric/internal/plugins/db/fsdb"
@@ -74,9 +75,7 @@ func (h *PatternsHandler) ApplyPattern(c *gin.Context) {
 			variables[key] = values[0]
 		}
 	}
-	for key, value := range request.Variables {
-		variables[key] = value
-	}
+	maps.Copy(variables, request.Variables)
 
 	pattern, err := h.patterns.GetApplyVariables(name, variables, request.Input)
 	if err != nil {