Adds a new --priority (-p) flag to filter issues by priority:
- bd show --priority 0 shows all P0 issues
- bd show -p 0 -p 1 shows all P0 and P1 issues
- Can be used multiple times to show multiple priority levels
- Combines with --all-issues if both are specified
- Works only in direct mode (--no-daemon required for now)
This makes it easy to focus on high-priority issues without
needing to specify each issue ID individually.
Example: bd show -p 0 -p 1 shows all critical and high-priority
issues in the database.
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