Bump traefik from v3.7.7 to v3.7.8 in /compose/production/traefik

[dependabot]

Bumps traefik from v3.7.7 to v3.7.8.

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[claude]

Review

This is a routine Dependabot patch bump for the Traefik base image used in compose/production/traefik/Dockerfile (v3.7.7 → v3.7.8), with no other code changes.

• Code quality / bugs: N/A — single-line version bump, straightforward.
• Security: Patch releases from Traefik typically include bug/security fixes; bumping is generally the safer choice. Worth a quick skim of the v3.7.8 release notes to confirm no breaking changes to entrypoints/middleware config used in this repo's traefik.yml/dynamic config before merging.
• Tests: No application code affected; existing CI should cover it. Since this touches the production image, it'd be worth confirming the production compose stack still boots/routes correctly (e.g., a quick docker compose -f production.yml up smoke test or relying on staging deploy) before/after merge, per this repo's "always run migrations first, then start main services" production deployment guidance — though this bump itself doesn't touch migrations.

No blocking concerns. Safe to merge pending the usual Dependabot compatibility checks passing.