Add automated infrastructure provisioning scripts

[mekererenate-web]

This PR adds three PowerShell scripts to automate
the full infrastructure redeploy process.

Scripts added

scripts/backup-database.ps1

• Backs up the live PostgreSQL database from the
  current DB droplet to your laptop before deleting

scripts/create-infrastructure.ps1

• Creates 3 new DigitalOcean droplets
• Installs PostgreSQL and restores the database
• Installs Docker on manager and worker
• Initialises Docker Swarm and joins the worker
• Saves new IPs automatically for the deploy step

scripts/deploy-existing.ps1

• Copies all config files to the new manager
• Writes the .env file with correct IPs
• Deploys the minitwit stack
• Deploys the monitoring stack

How to use tomorrow

Step 1 - backup while old droplets are still alive:
.\scripts\backup-database.ps1

Step 2 - delete the 3 old droplets on DigitalOcean

Step 3 - create everything fresh:
.\scripts\create-infrastructure.ps1 -Apply

Step 4 - deploy the app:
.\scripts\deploy-existing.ps1

Notes

• No changes to app code, Docker images or compose files
• Dry run by default, only runs with -Apply flag
• SSH key ID set to 56072776 (minitwit-local)

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mekererenate-web]

Monitoring also added. I dont know no one has loooked at this pull requet looks good to me, i have to accept it because its been a lreally ong time and we have to hand in the report tomorrow!