🪲 BUG-#235: Fix deploy --platform lambda-scheduled ignoring missing --schedule

[FernandoCelmer]

Description

Fix dotflow deploy --platform lambda-scheduled silently deploying without EventBridge trigger when --schedule is not provided.

Issue: 📌 ISSUE-#235

Changes

• Add ScheduleResolver to deploy.py — reads schedule from --schedule arg, template.yaml, or user input
• Add AWSSchedule in cloud/aws/schedule.py — converts crontab to EventBridge format, reads SAM templates
• Organize deployers into deployers/ subfolders (AWS, GCP, GitHub)
• Move platform constants (PLATFORMS, DEFAULT_REGION, SAM_PLATFORMS, SCHEDULED_PLATFORMS) to provider constants
• Remove dead code (ensure_roles, ensure_logs no-ops)
• Add PyYAML to deploy-aws optional dependency
• Deploy methods now use convention _deploy_{platform_snake_case} — no mapping dict needed

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes