feat(sqlalchemy): validate UUID input fields

[aiolibsbot]

What: UUID columns now emit a regex validator so admin create/edit forms reject malformed UUIDs client-side.

Why: sa.Uuid mapped to a plain TextInput with no validation (the # TODO: validators on the mapping). Any string was accepted in the form and only rejected server-side by Pydantic — a worse UX than the surrounding validated inputs. Part of #666 (TODO cleanup).

How: Added a canonical-form UUID pattern (8-4-4-4-12 hex, matching str(uuid.UUID(...))) and appended a regex validator for sa.Uuid columns in _get_validators. The frontend already deserializes regexp validator state into a RegExp, so no admin-js change is needed. Server-side Pydantic validation is unchanged and remains authoritative.

Testing: New test_uuid_validator asserts the emitted validator. Full suite: 98 passed, 1 xfailed; the lone test_admin_view failure is pre-existing (#934) and unrelated.

---

Quality Report

Changes: 2 files changed, 22 insertions(+), 1 deletion(-)

Code scan: clean

Tests: failed (command not found)

Branch hygiene: clean

Generated by Kōan

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.65%. Comparing base (2448fd1) to head (4f4c2d2).
⚠️ Report is 168 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1168      +/-   ##
==========================================
+ Coverage   95.56%   95.65%   +0.08%     
==========================================
  Files          21       21              
  Lines        2954     2966      +12     
  Branches      193      201       +8     
==========================================
+ Hits         2823     2837      +14     
+ Misses        105      103       -2     
  Partials       26       26              

Flag	Coverage Δ
integration	80.92% <33.33%> (-0.03%)	⬇️
js	83.89% <ø> (ø)
unit	97.51% <100.00%> (+0.09%)	⬆️

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