Perf: Batch load SKOS root classes

[mdorf]

Summary

• Replace per-root Class.find hydration with one ID-constrained batch load.
• Load the required root attributes in the same query.
• Preserve SKOS predicate fallback, empty results, pagination, and ordering.
• Advance Goo to the revision containing #191.

Fixes #306.

Performance

Measured through a local API process against the staging AllegroGraph data using AGROVOC /classes/roots?include=prefLabel (25 roots).

Five warmups were followed by 50 alternating measured requests per version.

Version	Median	p95	Mean
Before	454.1 ms	645.0 ms	484.5 ms
After	236.9 ms	298.7 ms	242.9 ms
Improvement	47.8%	53.7%	49.9%

A second run with 30 requests per version confirmed a 47.6% median improvement. Canonical response bodies were identical before and after.

The six-root regression fixture also reduces Goo SPARQL queries from 9 to 3.

Verification

• SKOS submission tests: 13 runs, 169 assertions.
• Root-class tests: 2 runs, 73 assertions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.02%. Comparing base (d3796b5) to head (b67edaf).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #309      +/-   ##
===========================================
+ Coverage    81.85%   82.02%   +0.17%     
===========================================
  Files          101      101              
  Lines         6849     6853       +4     
===========================================
+ Hits          5606     5621      +15     
+ Misses        1243     1232      -11     

Flag	Coverage Δ
ag	81.94% <100.00%> (+0.17%)	⬆️
fs	82.00% <100.00%> (+0.18%)	⬆️
gd	81.96% <100.00%> (+0.20%)	⬆️
unittests	82.02% <100.00%> (+0.17%)	⬆️
vo	81.92% <100.00%> (+0.20%)	⬆️

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