fix(web,docs): unbreak prefixed-locale routes and /docs redirects

[yannickmonney]

Summary

Two regressions surfaced after #1690's locale-negotiation rollout:

• services/web — Vite's base: './' made dist/index.html reference ./assets/.... The SPA shell is the fallback for any non-prerendered route, so the new redirect /pricing → /de/pricing resolved the relative URL against /de/ and requested /de/assets/index-XXX.js. That path falls back to index.html again with Content-Type: text/html, the browser refuses the module, page is blank. Switch to base: '/' so the shell is self-contained at any depth.
• services/docs — Caddy mounts docs at /docs via handle_path /docs* (strips the prefix). The server emitted Location: /de, which is origin-relative → browser landed on the web site's /de instead of /docs/de. Promote DOCS_BASE_URL to a runtime env on the runner stage and prepend it to the redirect target. Default (/) is a no-op, preserving the existing docs.tale.dev deployment.

Reproduction (before)

$ curl -sI -H "Cookie: tale_locale=de" https://tale.dev/docs
HTTP/2 302
location: /de            ← should be /docs/de

$ curl -sI https://tale.dev/de/assets/index-CLmaLWA4.js
HTTP/2 200
content-length: 2090     ← the SPA fallback HTML, not JS

Playwright at /de/pricing: blank, console error Failed to load module script: Expected a JavaScript-or-Wasm module script but the server responded with a MIME type of "text/html".

Test plan

• After deploy, curl -sI -H "Cookie: tale_locale=de" https://tale.dev/docs returns Location: /docs/de
• After deploy, https://tale.dev/de/pricing renders the German pricing page (no module-MIME error in devtools)
• https://tale.dev/pricing (English) still renders correctly
• https://tale.dev/docs (English) still renders the docs landing page
• i18n package tests still pass (45 tests, verified locally)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Configuration Updates
  • Documentation service now supports deployment under custom paths for flexible hosting configurations.
  • Web application asset loading updated for consistent reference handling across different URL structures.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR enables sub-path mounting for the docs and web services. The docs Dockerfile now passes DOCS_BASE_URL from build-time arguments into the runtime environment. The docs server reads this value, derives a normalized BASE_PATH, and prefixes locale-negotiation redirects with it. The web app's Vite configuration switches from a relative base (./) to an absolute base (/) to ensure consistent asset loading from nested routes. These changes allow both services to operate correctly when served from non-root paths.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• tale-project/tale#1684: Related changes to docs Dockerfile and base path configuration for sub-path mounting support.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main fixes: correcting prefixed-locale routes in web and /docs redirects, matching the primary changes in vite.config.ts and server.ts.
Description check	✅ Passed	The description provides a clear summary with context, reproduction steps, and a detailed test plan, though the pre-merge checklist is incomplete with unchecked boxes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/web-spa-base-and-docs-redirect-prefix

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