Add comprehensive backup system for Gitea database

backup-gitea-db.ps1

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+# Gitea Database Backup Script
+$timestamp = Get-Date -Format "yyyy-MM-dd_HH-mm-ss"
+$backupDir = ".\backups"
+$backupFile = "$backupDir\gitea-db-backup-$timestamp.sql"
+
+# Ensure backup directory exists
+if (-not (Test-Path $backupDir)) {
+    New-Item -ItemType Directory -Path $backupDir
+}
+
+# Create database dump
+Write-Host "Creating database backup to $backupFile..."
+docker exec gitea-db pg_dump -U gitea -d gitea > $backupFile
+
+# Check if backup was successful
+if ($LASTEXITCODE -eq 0 -and (Test-Path $backupFile) -and (Get-Item $backupFile).Length -gt 0) {
+    Write-Host "Backup completed successfully!"
+    
+    # Optional: Compress the backup file
+    Compress-Archive -Path $backupFile -DestinationPath "$backupFile.zip" -Force
+    Remove-Item $backupFile
+    Write-Host "Backup compressed to $backupFile.zip"
+} else {
+    Write-Host "Backup failed!" -ForegroundColor Red
+}
+
+# Optional: Clean up old backups (keep last 10)
+$oldBackups = Get-ChildItem -Path $backupDir -Filter "gitea-db-backup-*.zip" | Sort-Object LastWriteTime -Descending | Select-Object -Skip 10
+foreach ($backup in $oldBackups) {
+    Remove-Item $backup.FullName
+    Write-Host "Removed old backup: $($backup.Name)"
+}