feat(jtk): port init and config test commands

[rianjs]

Port the init wizard and config test from jira-ticket-cli PR #59.

Files to create:

• tools/jtk/internal/cmd/initcmd/initcmd.go - jtk init command

Features:

jtk init - Interactive setup wizard:

• Prompts for URL, email, API token
• Verifies connection before saving (--no-verify to skip)
• Non-interactive mode: --url, --email, --token flags
• Detects existing config, prompts for overwrite

jtk config test - Connectivity verification:

• Tests authentication and API access
• Clear pass/fail with troubleshooting suggestions

Source: open-cli-collective/jira-ticket-cli#59

[rianjs]

Implementation Plan

Changes:

1. Create tools/jtk/internal/cmd/initcmd/initcmd.go

   • jtk init command with interactive wizard
   • Prompts for URL, email, API token
   • Verifies connection before saving (--no-verify to skip)
   • Non-interactive mode: --url, --email, --token flags
   • Detects existing config, prompts for overwrite

2. Add newTestCmd to tools/jtk/internal/cmd/configcmd/configcmd.go

   • jtk config test command for connectivity verification
   • Tests authentication and API access
   • Clear pass/fail with troubleshooting suggestions

3. Update tools/jtk/cmd/jtk/main.go

   • Register initcmd.Register

4. Add tests

   • initcmd_test.go for init command flows
   • configcmd_test.go for config test command

Source: jira-ticket-cli PR #59