docs: Add comprehensive documentation and architecture guides

[m1ngsama]

Summary

Add complete documentation suite for the automa IaC platform.

Changes

Documentation Files

• QUICKSTART.md: 5-minute setup guide for rapid deployment
• CHEATSHEET.md: Quick reference for daily operations
• OPTIMIZATION_SUMMARY.md: Complete architecture overview and implementation summary
• docs/ARCHITECTURE.md: Detailed system design and component analysis
• docs/IMPLEMENTATION.md: Step-by-step implementation guide
• docs/architecture-recommendations.md: Component selection rationale and alternatives

Configuration

• .env.example: Configuration template with all required variables

Key Features

• KISS Principles: Keep It Simple, Stupid - no over-engineering
• Unix Philosophy: Each tool does one thing well
• Production-Ready: Security, monitoring, backups included
• Comprehensive: Setup, troubleshooting, maintenance guides
• Beginner-Friendly: Clear examples and explanations

Documentation Structure

docs/
├── architecture-recommendations.md  (Component selection analysis)
├── IMPLEMENTATION.md                (Step-by-step guide)
├── ARCHITECTURE.md                  (System design)
QUICKSTART.md                        (5-min setup)
CHEATSHEET.md                        (Quick ref)
OPTIMIZATION_SUMMARY.md              (Overview)

Target Audience

• DevOps engineers
• Self-hosters
• Home lab enthusiasts
• Anyone running Minecraft, TeamSpeak, Nextcloud

Related Issues

Addresses foundation for #3 and #4

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Ready for review - Documentation only, no code changes