Apply account_name parser to CLI parameters

Applies the account_name parser to all CLI parameters that accept
account names:
- Common templates (arguments.py, options.py)
- Process commands (main.py, proxy.py, vote_witness.py, custom_json.py)
- Process subcommands (update_authority.py, delegations.py)
- Configure commands (profile.py, working_account.py, tracked_account.py, known_account.py)
- Show commands (main.py - witness name)
- Generate commands (main.py)

🤖 Generated with [Claude Code](https://claude.com/claude-code

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>