fix[frontend](alerts): added alert severity

[AlexSanchez-bit]

No description provided.

[github-actions]

✅ AI review — Clean

No issues detected in this diff.

✅ architecture (gemini-3-flash-lite) — clean

Summary: Frontend-only UI enhancement adding severity badges to the alerts table and drawer across all locales.

No findings.

✅ bugs (gemini-3-flash-lite) — clean

Summary: Added severity column and details to alerts table and drawer with corresponding i18n strings.

No findings.

✅ security (gemini-3-flash-lite) — clean

Summary: UI refactoring to add severity column and badge styling to alerts views and i18n keys.

No findings.

🟢 go-deps — up to date

No pending Go dependency updates.