refactor: Extract profile commands from main.rs to dedicated module (Issue #402)

[joshrotenberg]

Summary

Extracts all profile command handlers from main.rs into a dedicated commands/profile.rs module, following the established pattern of commands/api.rs and commands/files_key.rs.

Changes

New Module: commands/profile.rs

Created new module with 8 focused handler functions:

• handle_list - List all profiles with table/JSON formatting
• handle_path - Show config file path
• handle_show - Show profile details
• handle_set - Create/update profiles with keyring support
• handle_remove - Remove profiles with confirmation
• handle_default_enterprise - Set default enterprise profile
• handle_default_cloud - Set default cloud profile
• handle_validate - Validate configuration (added in UX improvements: Better error messages and command hints #259)

Updated Files

• commands/mod.rs - Added pub mod profile;
• main.rs - Updated to call commands::profile::handle_profile_command()
• Removed unused Context import from main.rs

Impact

Before

main.rs: 1,589 lines
  - execute_profile_command: ~660 lines (42% of file)

After

main.rs: 929 lines (41.5% reduction)
commands/profile.rs: 719 lines

Benefits

1. Maintainability: Profile logic now in dedicated, focused module
2. Consistency: Follows pattern established by api.rs and files_key.rs
3. Testability: Can add unit tests for individual handlers
4. Separation of Concerns: main.rs focuses on CLI parsing and routing only
5. Easier Navigation: Developers can find profile logic in one place

Testing

• ✅ All 45 library tests passing
• ✅ No clippy warnings
• ✅ Code formatted with cargo fmt
• ✅ No behavior changes - pure code organization

Functionality Verification

All profile commands continue to work:

• redisctl profile list - Table and JSON output
• redisctl profile path - Show config path
• redisctl profile show <name> - Show profile details
• redisctl profile set <name> - Create/update profiles
• redisctl profile remove <name> - Remove with confirmation
• redisctl profile default-enterprise <name>
• redisctl profile default-cloud <name>
• redisctl profile validate - Configuration validation

Code Quality

• No clippy warnings (-D warnings)
• Proper error handling maintained
• Tracing/logging preserved
• Secure credential storage support intact

Related

Closes #402

Part of ongoing code quality improvements to make the codebase more maintainable.