fix: skip the messages route cache when caching is disabled

[lazerg]

• Resolves Messages cached handler with redis => ReplyError: ERR invalid expire time in set #4112

When message caching is disabled, the production route still runs through Nitro's cached event handler, and the module passes maxAge: -1 there to mean "do not cache". Nitro treats that as a real expiry and writes the response to storage with a negative TTL, which a Redis driver rejects with ERR invalid expire time in set. The route already serves uncached in development, so this now does the same whenever caching is off, keeping the negative TTL from ever reaching the store.

Summary by CodeRabbit

• Bug Fixes

  • Message responses now correctly bypass caching when caching is disabled, preventing unintended cache writes.

• Tests

  • Added coverage to verify that disabled caching returns messages without attempting to write cache entries.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: aff8745b-5509-428d-97dc-615a6dfc3f58

📥 Commits

Reviewing files that changed from the base of the PR and between a0b2db7 and 25d6302.

📒 Files selected for processing (2)

• src/runtime/server/routes/messages.ts
• test/messages-route.test.ts

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Walkthrough

The messages route now uses the non-cached handler when development mode is enabled or __I18N_CACHE__ is disabled. A Vitest suite mocks the cache and i18n utilities, loads the route with a mock event, and verifies that disabled caching returns localized messages without performing cache writes.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: bypassing the messages route cache when caching is disabled.
Linked Issues check	✅ Passed	The changes address #4112 by routing around the cached handler when I18N_CACHE is disabled and adding a regression test.
Out of Scope Changes check	✅ Passed	The diff is focused on the cache-bypass fix and its test, with no obvious unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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