feat: configuration profiles for scenario-based switching

[ourines]

Problem

Users may need different combinations of settings for different scenarios (work vs personal, dev vs production).

Proposal

# Create a profile
codes profile create work --config official --behavior last --skip-permissions true

# Switch profile (changes default config + all associated settings)
codes profile use work

# List profiles
codes profile list

Profile contains

• Default config name
• defaultBehavior setting
• skipPermissions setting
• Optional: working directory
• Optional: project associations