Add CI workflow for developer CLI and tighten frontend-quality gates

[tjementum]

Summary & Motivation

Bring the developer CLI under CI and close two gaps in the existing frontend pipeline.

• Add .github/workflows/developer-cli.yml that runs build, format, and lint on the developer CLI whenever files under developer-cli/** change. Mirrors the backend pattern from main.yml and skips the CLI's self-rebuild path with DEVELOPERCLI_SKIP_CHANGE_DETECTION=1. Make it a required check on main to gate merges.
• Add a frontend formatting diff check to main.yml and account.yml (run npm run format then git diff --exit-code). The backend already had this; the frontend only ran lint, so oxfmt/oxlint --fix drift could land silently.
• Replace the AI-driven translate developer-CLI command with a missing-translation check inside lint --frontend. The check parses every non-en-US .po file (excluding node_modules) with Karambolo.PO and fails with a per-file count when entries have empty msgstr. Drops the translate command and its OpenAI/Azure dependency closure (Azure.AI.OpenAI, Microsoft.Extensions.AI{,.OpenAI}, OpenAI). Karambolo.PO is kept for the new check; SecretHelper is kept since downstream projects may use it.
• Fill in the existing 26 missing Danish translations in account/WebApp and account/BackOffice so the new check passes on this branch.
• Drop dotCover from the PR workflows in main.yml / account.yml. SonarCloud's static analysis stays; coverage is not enforced on PRs. Re-introducing coverage on main (full-backend, no TypeScript) is tracked separately.
• Drop the now-stale Coverage badge from README.md since coverage is no longer produced on every PR.
• Drop the redundant forcePrompt: named argument in InstallCommand.GitHooksSync.Sync(true) so JetBrains cleanup doesn't rewrite it under the new format gate.

Checklist

• I have added tests, or done manual regression tests
• I have updated the documentation, if necessary

[linear]

PP-1187

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud