78c983136f
Replace String with Arc<str> for fields that contain repeated static values (mime_type, icon_class, icon_special_class, category) in FileDto, FolderDto, and OptimizedFileContent. These fields are computed from ~40 static lookup tables and cloned on every request. With Arc<str>, clone becomes O(1) atomic increment instead of O(n) heap allocation — saving thousands of allocations/s under load. Fields kept as String: id, name, path, folder_id, owner_id (unique per item, rarely cloned). Zero API impact — serde serializes Arc<str> identically to String. https://claude.ai/code/session_01EbAFEfyJNLRmJHmmYDX3Tt