WIP: feat(backend): sse with grip

[matmair]

Heavy WIP to test how a dedicated GRIP component would work for SSE / websockets

[netlify]

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Lighthouse	1 paths audited Performance: 93 (no change from production) Accessibility: 81 (no change from production) Best Practices: 100 (no change from production) SEO: 78 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

❌ Patch coverage is 9.52381% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.14%. Comparing base (3ca124c) to head (53f05b5).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10993      +/-   ##
==========================================
- Coverage   88.17%   88.14%   -0.04%     
==========================================
  Files        1289     1290       +1     
  Lines       58036    58057      +21     
  Branches     1970     1970              
==========================================
+ Hits        51174    51175       +1     
- Misses       6371     6391      +20     
  Partials      491      491              

Flag	Coverage Δ
backend	89.44% <9.52%> (-0.04%)	⬇️

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Components	Coverage Δ
Backend Apps	92.03% <ø> (ø)
Backend General	93.47% <ø> (ø)
Frontend	70.86% <ø> (ø)

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