Prepare LaunchStack CLI v2 release candidate

Author: wbizmo

CHANGELOG.md

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+# Changelog
+
+## 2.0.0
+
+LaunchStack CLI v2 expands the project from deployment workflow tooling into a backend API scaffolding and production workflow CLI.
+
+### Added
+
+- `launchstack create <project-name>`
+- Fastify API starter
+- TypeScript strict-mode template
+- Prisma and PostgreSQL
+- Docker Compose database service
+- JWT access and refresh tokens
+- Password hashing
+- Registration, login, refresh, logout, and profile routes
+- Zod request and response validation
+- Swagger/OpenAPI documentation
+- Layered controllers, services, repositories, and DTOs
+- Structured application errors
+- Production Docker image
+- GitHub Actions workflows
+- Render, Railway, and Fly.io presets
+- Readiness and health endpoints
+- `launchstack doctor`
+
+### Existing capabilities retained
+
+- Project initialization
+- Environment switching
+- Provider management
+- Deployment history
+- Rollback visibility
+- Secrets management
+- Docker scaffolding
+- GitHub Actions generation