refactor(commands): merge fs/impor/fab_fs_import_item.py into fab_fs_import.py

[Copilot]

📥 Pull Request

✨ Description of new changes

The src/fabric_cli/commands/fs/impor/ directory was misspelled and contained a single file (fab_fs_import_item.py). Rather than renaming the directory to import (which is a Python keyword and would require importlib workarounds), the content of fab_fs_import_item.py has been merged directly into fab_fs_import.py and the subdirectory removed entirely.

• Summary: Eliminated the misspelled fs/impor/ subdirectory by merging fab_fs_import_item.py into fab_fs_import.py. The import_single_item function and its helpers now live directly in fab_fs_import.py, keeping the code simple with no importlib usage.
• Context: The impor/ directory name was a typo (should have been import), but since import is a Python keyword, a subdirectory with that name would require non-standard import mechanisms. Merging the files avoids this issue entirely and is consistent with keeping thin command files.
• Dependencies: None. No test changes needed — tests reference through the parser/command layer, not the subdirectory directly.

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