refactor: Rename project from dns-helper to ekdns across all files and documentation

lockfile/lockfile.go

@@ -8,7 +8,7 @@ import (
 )
 
 const (
-	lockFileName  = ".dns-helper.lock"
+	lockFileName  = ".ekdns.lock"
 	staleTimeout  = 2 * time.Minute
 	retryInterval = 200 * time.Millisecond
 	maxWait       = 2 * time.Second

lockfile/lockfile_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"dns-helper/lockfile"
+	"ekdns/lockfile"
 )
 
 // T006-1: Acquire succeeds and lock file exists on disk.
@@ -18,7 +18,7 @@ func TestAcquireSucceeds(t *testing.T) {
 	}
 	defer lock.Release()
 
-	lockPath := filepath.Join(dir, ".dns-helper.lock")
+	lockPath := filepath.Join(dir, ".ekdns.lock")
 	if _, err := os.Stat(lockPath); os.IsNotExist(err) {
 		t.Error("lock file does not exist after Acquire")
 	}
@@ -36,7 +36,7 @@ func TestReleaseDeletesLockFile(t *testing.T) {
 		t.Fatalf("Release returned unexpected error: %v", err)
 	}
 
-	lockPath := filepath.Join(dir, ".dns-helper.lock")
+	lockPath := filepath.Join(dir, ".ekdns.lock")
 	if _, err := os.Stat(lockPath); !os.IsNotExist(err) {
 		t.Error("lock file still exists after Release")
 	}
@@ -60,7 +60,7 @@ func TestDoubleAcquireFails(t *testing.T) {
 // T006-4: Stale lock file (>2 minutes old) is broken and Acquire succeeds.
 func TestStaleLockBroken(t *testing.T) {
 	dir := t.TempDir()
-	lockPath := filepath.Join(dir, ".dns-helper.lock")
+	lockPath := filepath.Join(dir, ".ekdns.lock")
 
 	// Manually create a lock file with a stale modification time.
 	if err := os.WriteFile(lockPath, []byte("99999\n"), 0644); err != nil {