Add interactive prompt for migrating from APIOps Toolkit to APIOps CLI

No se nombran archivos ni pruebas. Empieza por localizar el punto de entrada del comando CLI y el manejo existente de la configuración de Toolkit y CLI, los artefactos y las pipelines; después, asigna los criterios de aceptación a las fases de migración. Se considera terminado cuando un flujo interactivo de apiops migrate puede revisar y confirmar las conversiones, los datos del entorno, las sobrescrituras, los cambios en las pipelines y un informe resumido.

Problem

Customers currently using the APIOps Toolkit have no guided path to migrate to APIOps CLI. Migration requires manually converting configuration files, understanding schema differences, identifying missing properties, and rewriting CI/CD pipelines — all of which is error-prone and requires deep knowledge of both tools.

Context — Migration Challenges

1. Configuration file format differences — Toolkit and CLI use different file structures and schemas; manual conversion is tedious and easy to get wrong
2. Missing properties — The CLI may require properties that don't exist in Toolkit configuration files, and these need to be discovered from the running APIM environment
3. Override files — Newly fetched properties need to be intelligently categorized into override files (e.g., environment-specific values, secrets, backend URLs)
4. Pipeline migration — Existing CI/CD pipelines reference Toolkit-specific steps/tasks that must be replaced with APIOps CLI equivalents

Proposed Solution

Add a new interactive prompt (e.g., apiops migrate or similar) that guides users through a full migration from APIOps Toolkit to APIOps CLI. The prompt should:

1. Detect & Convert Existing Toolkit Files

• Scan the repository for existing APIOps Toolkit configuration and artifact files
• Map Toolkit file formats and schemas to their APIOps CLI equivalents
• Convert configuration files (extraction config, publisher config, etc.) to the CLI format
• Report any values that cannot be automatically mapped and prompt the user for input

2. Query Running APIM Environment for Missing Properties

• Connect to the user's Azure APIM instance to fetch any properties or resources that exist in the live environment but are absent from the Toolkit files
• Compare live state against the converted files to identify gaps
• Pull down missing artifacts as needed to produce a complete CLI-compatible artifact set

3. Smart Override File Generation

• For any additional properties pulled from the live environment, make intelligent decisions about what belongs in override files vs. base configuration
• Identify environment-specific values (e.g., backend URLs, named value secrets, diagnostic settings) and route them to the appropriate per-environment override files
• Use {#[TOKEN_NAME]#} placeholder syntax for secrets (per #117)
• Present recommendations to the user for review and confirmation before writing

4. Pipeline Migration

• Detect existing CI/CD pipeline files (GitHub Actions workflows, Azure DevOps pipelines)
• Identify and remove APIOps Toolkit-specific steps/tasks
• Replace them with the equivalent APIOps CLI steps
• Preserve any custom steps or configuration the user has added around the Toolkit steps
• Present a diff or summary of pipeline changes for user confirmation

5. Interactive & Best-Effort

• The prompt should be conversational — guide the user through each migration phase rather than requiring upfront knowledge
• Make sensible defaults and best-effort suggestions throughout
• Allow the user to review and confirm before writing any files
• Provide a summary report at the end listing what was migrated, what was added, and any manual steps remaining

Acceptance Criteria

• New interactive prompt is available (e.g., apiops migrate)
• Detects existing APIOps Toolkit configuration and artifact files in the repo
• Converts Toolkit configuration files to APIOps CLI format
• Connects to a running APIM environment to fetch missing properties/artifacts
• Intelligently assigns newly fetched properties to base config vs. override files
• Generates per-environment override files with {#[TOKEN_NAME]#} placeholder syntax for secrets
• Detects and migrates CI/CD pipelines (GitHub Actions and/or Azure DevOps)
• Removes Toolkit-specific pipeline steps and replaces with CLI equivalents
• Preserves custom pipeline steps during migration
• Provides interactive review and confirmation at each phase
• Produces a summary report of migration actions taken and any remaining manual steps
• Documentation explains how to run the migration prompt and what to expect