refactor(frontend): rename contact page to offline page and update routes/components
feat(frontend): add preset templates suite for offline contact page
Let new proxy rules choose direct, tunnel, or Pages origin the same way as the detail reverse-proxy section, instead of only accepting a single upstream URL.
- Update sidebar active menu button text color to use theme dynamic `sidebar-primary` variable instead of hardcoded hex value.
- Add missing `destructive-foreground` variables to default theme config and styles, resolving the black-on-black text contrast issue on confirmation dialog delete buttons.
- Update changelog to track these fixes.
- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.
ryan