fix(i18n): add missing German keys for MCP Server settings

[CodeGhost21]

Summary

The German locale was missing 20 keys introduced by the MCP Server settings panel (originally added without German translations and uncaught when the German locale itself was added in #2378). This causes pnpm i18n:check to fail on main, which cascades into:

• i18n Coverage workflow
• Frontend Unit Tests (2 failures: I18nContext.test.tsx > keeps the German locale complete against English keys, coverage.test.ts > locale de defines every English key)
• Frontend Coverage (Vitest) (same 2 tests fail)
• Coverage Gate (diff-cover ≥ 80%) (cancelled because Frontend Coverage failed)

Every open PR is currently red on these checks for this reason — see #2249 for an example.

Changes

• app/src/lib/i18n/chunks/de-3.ts: +2 keys (subconscious.providerUnavailableTitle, subconscious.providerSettings)
• app/src/lib/i18n/chunks/de-5.ts: +18 keys (settings.developerMenu.mcpServer.{title,desc}, settings.mcpServer.*)

Product names (Claude Desktop, Cursor, Codex, Zed) are intentionally kept in English — they show as "untranslated" in the report but the check passes (untranslated count is informational, not a failure).

Verification

$ pnpm i18n:check
## de  (1947 keys)
  missing:        0
  extra:          0
  drifted chunks: 0
exit: 0

$ pnpm exec vitest run src/lib/i18n/__tests__/I18nContext.test.tsx src/lib/i18n/__tests__/coverage.test.ts
Test Files  2 passed (2)
     Tests  50 passed (50)

Test plan

• pnpm i18n:check exits 0
• I18nContext.test.tsx German-completeness suite passes
• coverage.test.ts > locale de defines every English key passes
• Prettier formatting clean

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR extends German localization support by adding translation strings to two localization chunks. It introduces subconscious provider UI text in de-3.ts and comprehensive MCP server configuration panel translations in de-5.ts, including client selector labels and error messaging.

Changes

German Localization Additions

Layer / File(s)	Summary
Subconscious feature German translations app/src/lib/i18n/chunks/de-3.ts	Two new German translation keys added to the de3 map for subconscious provider unavailable title and provider settings labels.
MCP server UI German translations app/src/lib/i18n/chunks/de-5.ts	Twenty-two new German translation keys added to the de5 map covering MCP server configuration UI: developer menu titles, section labels, copy/open config actions, error messages, binary-not-found guidance, and MCP client selector names (Claude Desktop, Cursor, Codex, Zed).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• tinyhumansai/openhuman#2378: Overlapping German translation chunk updates in the same i18n modules for subconscious and related namespace localization.
• tinyhumansai/openhuman#2440: Parallel localization work on MCP server settings translation chunks, though for a different language locale (zh-CN-5.ts vs. de-5.ts).

Suggested labels

working

Suggested reviewers

• graycyrus

Poem

🐰 Ah, translation time—a hoppy task!
German words in proper mask,
Subconscious whispers, MCP's call,
Locale chunks now speak it all!
✨ Multilingual magic, strings so true 🌍

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding missing German translation keys for MCP Server settings. It is specific, concise, and directly reflects the changeset content.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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[CodeGhost21]

Superseded by #2482, which bundled the same German MCP / subconscious key additions alongside the socketio origin fix and landed first. pnpm i18n:check on current main (62727e1d) reports 0 missing for de.