feat(ui): proxy legacy /print to backend (restores First-Print smoke curl)

[strausmann]

Summary

Restores the Phase 4 First-Print ad-hoc smoke-test workflow via Pangolin.

Before Phase 7, `curl -X POST http://hhdocker02:8000/print -d '...'` worked from inside the Tailscale network because the backend container exposed port 8000. After Phase 7 placed the Frontend Go proxy in front of the backend AND stopped publishing port 8000, that direct curl 404'd. The Frontend proxy mounts `/api/*`, `/docs`, `/openapi.json`, `/redoc`, `/readiness`, `/healthz` — but the legacy Phase-4 `/print` route was missed.

Adds `r.Handle("/print", prx)` so `POST https://labels.strausmann.cloud/print\` reaches the backend with the Pangolin Basic-Auth bypass.

Round 2 in this PR

Commit `805fdcd` initially also added `r.Handle("/jobs/{rest:.*}", prx)` to enable JSON-based job-status checks. This had higher chi route priority than the existing `r.Get("/jobs/{id}", ph.JobDetail)` frontend HTML page — browsers visiting `labels.strausmann.cloud/jobs/` got the backend JSON instead of the rendered page. Commit `0d06e74` reverts that `/jobs` catch-all — only `/print` is added in net.

If automated scripts later need JSON-based job status access, the upcoming Phase 7d `/api/jobs` endpoint (#80) will cover that path cleanly, or a follow-up PR could add Accept-header sniffing for `/jobs/{id}`.

Test plan

• New `TestProxyMountsLegacyFirstPrintRoutes` subtest: POST /print → 202 with job_id
• Existing `TestJobDetail*` frontend tests pass — confirming `/jobs/{id}` HTML page intact
• `go vet ./...` clean
• Production smoke after merge: `curl -u claude-automation:... -X POST https://labels.strausmann.cloud/print -d '{...}'` → 202 + job_id

Commits

SHA	Was
805fdcd	feat(ui): proxy legacy /print + /jobs/{id} (initial — /jobs part was UI-regression)
0d06e74	fix(ui): revert /jobs proxy — kept only /print

Refs #22

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request restores the legacy /print endpoint functionality that was lost following recent infrastructure changes. By updating the frontend proxy configuration, it ensures that automated smoke tests can successfully reach the backend while maintaining the integrity of existing browser-based routes.

Highlights

• Route Restoration: Added the /print route to the frontend proxy to restore legacy ad-hoc smoke test functionality.
• Regression Prevention: Implemented a new test case, TestProxyMountsLegacyFirstPrintRoutes, to ensure the /print endpoint correctly forwards requests to the backend.
• Route Separation: Explicitly excluded /jobs/{id} from the proxy to prevent conflicts with existing HTML page rendering.

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[gemini-code-assist]

Code Review

This pull request restores the legacy /print endpoint in the Go frontend proxy to support existing smoke tests and adds a corresponding integration test. Feedback includes a high-priority security concern regarding the use of a real internal hostname in test comments, which violates the repository's privacy guidelines. Additionally, it is recommended to use the existing testRouterWithBackend helper function in the new test to reduce code duplication and redundant initialization.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.98%. Comparing base (4e74a03) to head (3a0077f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   91.98%   91.98%           
=======================================
  Files          70       70           
  Lines        3055     3055           
  Branches      261      261           
=======================================
  Hits         2810     2810           
  Misses        181      181           
  Partials       64       64           

Components	Coverage Δ
Printer Backends (transport)	87.50% <ø> (ø)
Printer Models (drivers)	91.42% <ø> (ø)
Services	92.09% <ø> (ø)
REST API	91.30% <ø> (ø)
Pydantic Schemas	100.00% <ø> (ø)
Integration Plugins	100.00% <ø> (ø)

Flag	Coverage Δ
backend	91.98% <ø> (ø)

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[Copilot]

Pull request overview

Restores the legacy First-Print smoke path by routing /print through the Go frontend reverse proxy to the backend.

Changes:

• Adds /print to frontend proxy mounts.
• Adds a Go router test verifying POST /print returns the backend 202 response.
• Documents that /jobs/{id} remains served by the frontend HTML handler.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
frontend/cmd/server/main.go	Registers /print with the backend reverse proxy.
frontend/cmd/server/main_test.go	Adds coverage for the legacy /print proxy route.