feat: add Miniflux template

[Artemis-ignis]

What is this PR about?

Adds a Dokploy template for Miniflux, a minimalist self-hosted RSS/Atom feed reader.

This template includes:

• Miniflux 2.2.19 with a pinned Docker image
• PostgreSQL 18 Alpine with persistent storage
• automatic migrations and first admin user creation
• Dokploy domain configuration for the Miniflux web UI
• SVG logo and meta.json registry entry

Validation

• Ran node dedupe-and-sort-meta.js
• Ran npm run validate-template -- --dir ../blueprints/miniflux from build-scripts
• Ran npm run validate-docker-compose -- --file ../blueprints/miniflux/docker-compose.yml from build-scripts
• Verified meta.json duplicate count, sort order, and logo path
• Tested in a live Dokploy instance

Issues related

Refs #152
/claim #152

[Artemis-ignis]

/claim #152

[github-actions]

built with Refined Cloudflare Pages Action

⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
templates	✅ Ready (View Log)	Visit Preview	dbd929d

[Artemis-ignis]

Validation update for this PR:

• node dedupe-and-sort-meta.js passes with 390 entries and 0 duplicates.
• npm run validate-template -- --dir ../blueprints/miniflux passes.
• npm run validate-docker-compose -- --file ../blueprints/miniflux/docker-compose.yml passes.
• pnpm exec tsc -b passes for the preview app.
• Cloudflare preview is Ready for commit dbd929d.
• Verified the preview page loads without console errors in a fresh Chrome tab and the Miniflux card is visible.

Note: I have not tested importing it into a live Dokploy instance yet.