Resolve merge conflicts in passthrough filesystem implementation

[Copilot]

Merge conflicts existed in the passthrough filesystem between bind mount support and UID/GID mapping features.

Changes

config.rs

• Added both bind_mounts: HashMap<PathBuf, BindMount> and mapping: IdMappings fields to Config struct
• Removed duplicate imports

async_io.rs

• Adopted refactored do_mkdir_inner() and do_create_inner() helper methods for flexibility
• Preserved readonly bind mount permission checks via check_write_permission()

passthrough_example.rs

• Combined CLI arguments: --bind for bind mounts, --options for UID/GID mappings
• Both features initialize through unified Config struct

mod.rs

• Removed duplicate Path import

Result

Both features now coexist. Example usage:

passthrough_example \
  --mountpoint /mnt \
  --rootdir /source \
  --bind volumes:/host/volumes \
  --bind data:/host/data:ro \
  --options "uidmapping=1000:0:1,gidmapping=1000:0:1"

Original prompt

解决冲突

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