fix(tts): sync canonical/alias fields to prevent voice/model/base URL rollback

[dbmizrahi]

Summary

This PR fixes a TTS settings persistence bug where updated provider values (voice/model/base URL) could revert after page reload. The fix keeps canonical and compatibility alias fields synchronized in the UI payload so backend resolution cannot persist stale values.

Type

• Feature
• Bug fix
• Hotfix (targeting main)
• Refactor
• Docs
• CI/CD

Target Branch

dev

Checklist

• go build ./... passes
• go build -tags sqliteonly ./... passes (if Go changes)
• go vet ./... passes
• Tests pass: go test -race ./...
• Web UI builds: cd ui/web && pnpm build (if UI changes)
• No hardcoded secrets or credentials
• SQL queries use parameterized $1, $2 (no string concat)
• New user-facing strings added to all 3 locales (en/vi/zh)
• Migration version bumped in internal/upgrade/version.go (if new migration)

Test Plan

1. Open TTS settings page.
2. Select provider elevenlabs and change:
   • voice
   • model
   • base URL
3. Save settings.
4. Reload the page.
5. Verify values remain unchanged (no rollback).
6. Repeat with provider minimax for voice/model.

Validation performed in this fix:

• ui/web/src/pages/tts/tts-page.tsx lint: no errors/warnings.
• ui/web/src/pages/tts/sections/credentials-section.tsx lint: no errors/warnings.

Implementation notes covered by this PR:

• voice and voice_id are updated together for elevenlabs and minimax.
• model and model_id are updated together for elevenlabs and minimax.
• api_base and base_url are updated together for elevenlabs.
• Read-side fallback now tolerates either canonical or alias field when populating selectors.

[dbmizrahi]

Since I don't have permissions to re-run the PR checks I can only confirm that integration test that failed in the pipeline has passed on my machine:

go test -race -tags integration ./tests/integration -run TestOpenAIChat_AbortContextCancel -count=1
ok      github.com/nextlevelbuilder/goclaw/tests/integration    2.072s