feat(issue): Short ID aliases for monorepo support

[betegon]

Summary

Add short ID aliases for easier issue lookup in monorepos with multiple Sentry projects.

Features

# In a monorepo with spotlight-electron, spotlight-website projects:
$ sentry issue list
# Shows issues with aliases: e, w

$ sentry issue get e-4y
# Expands to SPOTLIGHT-ELECTRON-4Y

# Single project mode:
$ sentry issue get 4y
# Expands to PROJECT-4Y

• Alias-suffix format: Type e-4y instead of SPOTLIGHT-ELECTRON-4Y
• Smart prefix stripping: Common prefixes stripped for shorter aliases
• Cached aliases: Aliases cached from issue list for fast lookup

Implementation

• PR feat(issue): add short ID aliases for multi-project support #31 implements this feature

Acceptance Criteria

• issue list shows aliases for each project
• issue get accepts alias-suffix format
• Aliases are cached for fast lookup
• Works with explain/fix commands

Closes when PR #31 is merged.

[betegon]

closed with #31