The share command now supports `list`, `see`, and merging operations
with conflict resolution modes (--safe, --skip, --overwrite, --reject).
Updated help documentation in both English and Chinese locales, and
added Bash and PowerShell completion scripts.

- Include branch and commit hash in compile info display
- Add build script functions to extract git metadata
- Update export scripts to force rebuilds when needed
- Extend share command with placeholder implementations

The help text for `jv track` has been rewritten to emphasize its role as
a declaration of fact rather than a simple upload/download operation.
The new text explains the three scenarios: creation (when a file is
untracked), update (when you hold the file), and synchronization (when
you don't hold the file). The Chinese locale has been updated
accordingly.

- Change "YOURS" to "VISIBLE TO YOU" and "您的表" to "您可见的表"
- Add reference sheet suffix indicator for reference sheets
- Update Chinese share command help text to clarify mapping operations
- Rename sheet list variables for clarity (my_sheets → visible_sheets,
  other_sheets → invisible_sheets)
- Show status automatically after switching sheets

- Add `jv account as host/<ACCOUNT_NAME>` command for host mode
- Display host mode status in `jv here` and `jv status`
- Add reference sheet read-only mode hints and restrictions
- Show host mode capabilities and warnings in status output
- Prevent structural changes in reference sheets for non-hosts