init: first extract of implementation

cli/__init__.py

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+"""
+Command Line Interface for Universal Issue Tracking
+
+Provides a comprehensive CLI for managing issues across different backends.
+The CLI is designed to be intuitive and follows common patterns from
+tools like git, gh (GitHub CLI), and similar utilities.
+
+Commands:
+- issue list: List issues
+- issue show: Show issue details
+- issue create: Create new issue
+- issue edit: Edit existing issue
+- issue close: Close issue
+- issue reopen: Reopen issue
+- issue comment: Add comment
+- issue label: Manage labels
+- issue assign: Manage assignments
+- backend: Manage backends
+- sync: Synchronization operations
+"""