chore: improve DX and deployment workflows

[btcneves]

Summary

• Add a Windows PowerShell setup script with Docker, WSL, port, environment, Compose, and build validation.
• Harden Linux, macOS, and Windows setup scripts with activity validation, missing argument handling, Compose config checks, and full-stack profile defaults.
• Set COMPOSE_PROFILES=all as the default stack profile and align Makefile commands with Docker Compose profiles.
• Add a manual GitHub Actions deploy workflow for VPS and VPS + Cloudflare Tunnel targets.
• Add docker-compose.cloudflare.yml for named Cloudflare Tunnel deployments.
• Standardize smoke test output and update deployment/DX documentation.

Validation

• bash -n scripts/setup-linux.sh scripts/setup-mac.sh scripts/quickstart.sh scripts/smoke-test.sh
• docker compose --profile all config
• CLOUDFLARE_TUNNEL_TOKEN=dummy-token docker compose -f docker-compose.yml -f docker-compose.cloudflare.yml --profile all --profile cloudflare config
• YAML parsing for .github/workflows/*.yml
• Local Markdown link check across repository docs
• git diff --check
• Verified no assistant-specific attribution is present.