feat: add DockRoute template

[danilodorgam]

Adds DockRoute (source, MIT) — External-DNS for plain Docker hosts. It watches running containers, reads dockroute.* labels and reconciles the matching DNS records (and Cloudflare Tunnel routes) in a pluggable provider, with ExternalDNS-style TXT ownership so it never alters records it cannot prove it manages.

Positioning for Dokploy users: DNS automation for the containers your platform doesn't route — internal/LAN DNS, Cloudflare Tunnel ingress, or records for services outside the Traefik flow.

Template notes:

• Headless service (no UI), so domains = [] — same shape as cloudflare-ddns / cloudflared.
• Defaults are safe: the log provider is a zero-credential dry run that only prints the desired state; switching DOCKROUTE_PROVIDER to cloudflare plus an API token goes live.
• Docker socket is mounted read-only; the image detects the socket's group at runtime and drops privileges to a non-root user by itself.
• Image ghcr.io/dockroute/dockroute:0.2.0, multi-arch (amd64 + arm64), Trivy-gated releases.

Validated with build-scripts: validate-template and validate-docker-compose both pass.

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