Update documentation with last updated dates and improve navigation indexes

- Added "Last Updated" date to multiple documentation files for better tracking.
- Enhanced the README with quick navigation indexes for guides, references, and architecture documentation.
- Updated titles in Keycloak deployment and testing guide for consistency.

docs/GUIDES_INDEX.md

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+# Documentation Guides Index
+
+**Last Updated**: 2025-01-09
+
+This index provides quick access to all how-to guides and tutorials in the documentation.
+
+## Getting Started
+
+- **[Development Guide](./DEVELOPMENT.md)** - Set up your development environment
+- **[Quick Start Guides](./smom-dbis-138-QUICK_START.md)** - Quick start instructions
+- **[Proxmox Quick Start](./proxmox/guides/QUICK_START.md)** - Proxmox setup quick start
+
+## Deployment Guides
+
+- **[Deployment Guide](./DEPLOYMENT.md)** - Production deployment instructions
+- **[Deployment Execution Plan](./DEPLOYMENT_EXECUTION_PLAN.md)** - Step-by-step deployment plan
+- **[Deployment Requirements](./DEPLOYMENT_REQUIREMENTS.md)** - Complete deployment requirements
+- **[Pre-Deployment Checklist](./PRE_DEPLOYMENT_CHECKLIST.md)** - Pre-deployment verification
+- **[VM Creation Procedure](./VM_CREATION_PROCEDURE.md)** - VM creation step-by-step
+- **[VM Deployment Checklist](./VM_DEPLOYMENT_CHECKLIST.md)** - VM deployment verification
+- **[Proxmox Deployment Guide](./proxmox/guides/DEPLOYMENT_GUIDE.md)** - Proxmox deployment procedures
+
+## Configuration Guides
+
+- **[Configuration Guide](../CONFIGURATION_GUIDE.md)** - General configuration (root level)
+- **[Environment Variables](../ENV_EXAMPLES.md)** - Environment variable examples
+- **[DNS Configuration](./proxmox/DNS_CONFIGURATION.md)** - DNS setup for Proxmox
+- **[TLS Configuration](./proxmox/TLS_CONFIGURATION.md)** - TLS/SSL configuration
+- **[SSH Setup](./proxmox/SSH_SETUP_WEB_UI.md)** - SSH configuration guides
+- **[Keycloak Deployment](./KEYCLOAK_DEPLOYMENT.md)** - Keycloak setup and configuration
+
+## Operational Guides
+
+- **[Monitoring Guide](./MONITORING_GUIDE.md)** - Monitoring and observability
+- **[Troubleshooting Guide](./TROUBLESHOOTING_GUIDE.md)** - Comprehensive troubleshooting
+- **[Operations Runbook](./OPERATIONS_RUNBOOK.md)** - Operational procedures
+- **[Proxmox Troubleshooting](./proxmox/SSH_TROUBLESHOOTING.md)** - Proxmox-specific troubleshooting
+
+## Development Guides
+
+- **[Development Guide](./DEVELOPMENT.md)** - Development setup and workflow
+- **[Testing Guide](./TESTING.md)** - Testing strategies and examples
+- **[Contributing Guide](./CONTRIBUTING.md)** - Contribution guidelines
+- **[Proxmox Development](./proxmox/DEVELOPMENT.md)** - Proxmox development setup
+
+## Guest Agent & VM Configuration
+
+- **[Guest Agent Checklist](./GUEST_AGENT_CHECKLIST.md)** - Guest agent configuration
+- **[Quick Install Guest Agent](./QUICK_INSTALL_GUEST_AGENT.md)** - Quick guest agent setup
+- **[Enable Guest Agent Manual](./enable-guest-agent-manual.md)** - Manual guest agent setup
+
+## Infrastructure Guides
+
+- **[Domain Migration](./infrastructure/DOMAIN_MIGRATION.md)** - Domain migration procedures
+- **[Cloudflare Domain Setup](./proxmox/CLOUDFLARE_DOMAIN_SETUP.md)** - Cloudflare configuration
+
+---
+
+**See Also:**
+- [Reference Documentation Index](./REFERENCE_INDEX.md) - All reference documentation
+- [Architecture Documentation Index](./ARCHITECTURE_INDEX.md) - Architecture documentation
+- [Main Documentation Index](./README.md) - Complete documentation index
+