test(integration): 添加正则 location 配置集成测试

- 测试 ~ 修饰符大小写敏感匹配
- 测试 ~* 修饰符大小写不敏感匹配
- 测试 ^~ 修饰符非正则前缀优先匹配

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/integration/regex_config_test.go

@@ -0,0 +1,60 @@
+package integration
+
+import (
+	"testing"
+
+	"github.com/valyala/fasthttp"
+	"rua.plus/lolly/internal/matcher"
+)
+
+func TestRegexConfigCaseSensitive(t *testing.T) {
+	// 测试 ~ 修饰符（case-sensitive）
+	// 创建 regex matcher，验证只匹配小写
+	m, err := matcher.NewRegexMatcher(`\.php$`, nil, 3, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !m.Match("/test.php") {
+		t.Error("~ modifier should match lowercase .php")
+	}
+	if m.Match("/test.PHP") {
+		t.Error("~ modifier should NOT match uppercase .PHP")
+	}
+}
+
+func TestRegexConfigCaseInsensitive(t *testing.T) {
+	// 测试 ~* 修饰符（case-insensitive）
+	m, err := matcher.NewRegexMatcher(`(?i)\.php$`, nil, 3, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !m.Match("/test.php") {
+		t.Error("~* modifier should match lowercase .php")
+	}
+	if !m.Match("/test.PHP") {
+		t.Error("~* modifier should match uppercase .PHP")
+	}
+}
+
+func TestPrefixPriorityNotRegex(t *testing.T) {
+	// 测试 ^~ 修饰符（非正则）
+	// 需要提供非 nil handler，否则 RadixTree 不会存储该节点
+	dummyHandler := func(ctx *fasthttp.RequestCtx) {}
+
+	engine := matcher.NewLocationEngine()
+	err := engine.AddPrefixPriority("/images", dummyHandler)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	result := engine.Match("/images/logo.png")
+	if result == nil {
+		t.Error("^~ should match prefix")
+	}
+	if result.LocationType == matcher.LocationTypeRegex || result.LocationType == matcher.LocationTypeRegexCaseless {
+		t.Error("^~ should NOT be treated as regex")
+	}
+	if result.LocationType != matcher.LocationTypePrefixPriority {
+		t.Errorf("^~ should have LocationTypePrefixPriority, got: %s", result.LocationType)
+	}
+}