Add --clear flag to docker logs command

[Goal651]

Description

Problem

Docker logs can grow very large, making it hard to view recent entries without scrolling.

Solution

Add a --clear flag to docker logs that:

• Prompts for confirmation and truncates log files for stopped containers (permanent, requires root).

Use Cases

• Quick viewing of logs without old output cluttering the screen.
• Managing large log files on disk.

Implementation

• Log truncation uses os.Truncate with root check.
• Includes unit tests.