feat: Complete Azure deployment automation and release packaging

[holgerimbery]

Infrastructure & Automation

• Automate PostgreSQL firewall rule creation during deploy.ps1 post-deployment
• Automate blob storage secret injection and connection string binding
• Implement idempotent secret management for both WebUI and Worker containers
• Extend deploy.ps1 to handle both postgres-conn and blob-conn secrets via Key Vault

Release & Packaging

• Create standalone quickstart-azure package for one-command deployments
• Package includes all 6 PowerShell deployment scripts (no git clone required)
• Generate both quickstart packages during release:
  • mate-quickstart-.zip (local Docker Compose)
  • mate-quickstart-azure-.zip (Azure deployment with scripts)
• Add workflow_dispatch trigger for manual prerelease creation from any branch
• Support dynamic prerelease versioning (v0.6.0-branch.runNumber or custom suffix)
• Auto-generate prerelease tags while preserving stable release protection

Documentation & Configuration

• Add comprehensive Azure deployment guide (README.md, QUICKSTART.md, DEPLOYMENT.md)
• Include configuration template (.env.template) with all documented variables
• Reorder quickstart options: Azure (Option B, recommended) before Build from Source (Option C)
• Add copyright headers to all PowerShell scripts per legal requirements
• Fix documentation typo in rate-limit error messages

Package Contents (quickstart-azure/)

• README.md — Full deployment guide with prerequisites, troubleshooting, and cost estimates
• QUICKSTART.md — Quick reference for rapid deployment (3-5 min)
• DEPLOYMENT.md — Technical workflow documentation
• .env.template — Configuration template with all Azure variables
• 6 PowerShell scripts — Complete automation: check-prerequisites, setup-env, deploy-whatif, deploy, setup-keyvault-secrets, cleanup-rg

Release Workflow Updates

• Add prerelease support: manual workflow dispatch from any branch
• Mark manual runs as prerelease in GitHub Releases
• Preserve tag-based stable release flow unchanged
• Only push 'latest' Docker tag for stable releases
• Attach both quickstart packages to GitHub Releases

This branch resolves production outages and enables both local and Azure deployment with full automation.