fix(ci): restore semantic release publishing

[hadrien]

Problem\n\n- Semantic-release cannot push version commits through the protected main branch.\n- Release errors are reported as successful no-release runs.\n\n# Solution\n\n- Use the existing administrator PAT for release pushes.\n- Compare next and last released versions before publishing.\n- Let semantic-release failures terminate the workflow.\n- Preserve required checks and existing action versions.\n\nfs-3z4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.74%. Comparing base (2419e9e) to head (476dde5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files           1        1           
  Lines         133      133           
  Branches        7        7           
=======================================
  Hits          130      130           
  Misses          3        3           

Flag	Coverage Δ
fastapi-post121	97.74% <ø> (ø)
fastapi-pre121	97.74% <ø> (ø)
sqlmodel	97.74% <ø> (ø)

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