feat(admin): add routed task evidence details

admin/internal/storage/evidence/durability_windows.go

@@ -0,0 +1,35 @@
+//go:build windows
+
+package evidence
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// syncDirectory uses an explicit directory handle because os.Open(...).Sync is not a portable
+// Windows directory durability boundary. Any unsupported filesystem or access failure is fatal:
+// callers must not make the corresponding evidence row visible in SQLite.
+func syncDirectory(path string) error {
+	pathPointer, err := syscall.UTF16PtrFromString(path)
+	if err != nil {
+		return fmt.Errorf("encode directory path for durability sync: %w", err)
+	}
+	handle, err := syscall.CreateFile(
+		pathPointer,
+		syscall.GENERIC_WRITE,
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
+		nil,
+		syscall.OPEN_EXISTING,
+		syscall.FILE_FLAG_BACKUP_SEMANTICS,
+		0,
+	)
+	if err != nil {
+		return fmt.Errorf("open directory for durability sync: %w", err)
+	}
+	defer syscall.CloseHandle(handle)
+	if err := syscall.FlushFileBuffers(handle); err != nil {
+		return fmt.Errorf("flush directory metadata: %w", err)
+	}
+	return nil
+}