feat: add powersync blueprint template

[ahmed-lotfy-dev]

Adds a PowerSync blueprint template for Dokploy.

PowerSync is an open-source sync engine for local-first apps. It syncs PostgreSQL data to mobile devices and browsers with real-time replication.

Template features:

• Single service (no MongoDB needed) — uses PostgreSQL for both source and bucket storage
• All configuration through environment variables (POWERSYNC_CONFIG_B64 / POWERSYNC_SYNC_CONFIG_B64)
• Pinned to journeyapps/powersync-service:1.21.0
• Service name matches blueprint folder name (powersync)

Checklist:

• Logo is valid PNG
• Docker image pinned to specific version
• Service name matches blueprint folder
• meta.json updated with correct format
• No accidental deletions from meta.json

[github-actions]

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Name	Status	Preview	Last Commit
templates	✅ Ready (View Log)	Visit Preview	a9a40ec