[Feature] Transaction Rollback

[5tjrtddt4k-cloud]

描述

This commit implements the transaction rollback feature as described in the issue. The changes include:

1. Added a rollback_transaction function in the history module that handles the rollback logic
2. Modified the History tab UI to listen for 'r' keypress and trigger rollback
3. For INSTALL transactions: runs the appropriate package manager remove command
4. For REMOVE transactions: attempts to reinstall the exact version using version pinning syntax
5. Added error handling for missing packages, version mismatches, and failed commands
6. Updated the transaction log to record rollback operations as new transactions
7. Added confirmation dialog before executing rollback

The implementation supports apt (Debian/Ubuntu) and pacman (Arch Linux) package managers with automatic detection.

变更

• src/history/rollback.py
• src/history/transaction_log.py
• src/history/__init__.py

测试

• 本地测试通过
• CI 检查通过

Closes #77

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