Add config management and version bump CLI commands

[cloud9c]

Summary

• Adds wvdsh config command to display current wavedash.toml settings at a glance
• Adds wvdsh config set <key> <value> to update config fields (branch, version, upload_dir, game_id) with validation
• Adds wvdsh version bump [patch|minor|major] for semver auto-increment
• Uses toml_edit crate for lossless TOML editing that preserves formatting and comments

Test plan

• wvdsh config shows current config
• wvdsh config set branch production updates branch and shows old → new
• wvdsh config set version 1.2.3 validates semver format
• wvdsh version bump patch increments 0.0.1 → 0.0.2
• wvdsh version bump minor increments to 0.1.0
• wvdsh version bump major increments to 1.0.0
• Verify wavedash.toml preserves formatting after each change

🤖 Generated with Claude Code