Remove unused service option constants

[dreikanter]

Changes:

• Remove the unused AVAILABLE_OPTIONS constants from the Loader, Normalizer, and Processor namespaces.

Why:

The constants have no callers and duplicate information already owned by the profile registry.

References:

• Related issue: Review the code structure #1010 (F-126)

Checks:

• Namespace modules remain defined.
• GitHub Actions will verify the branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.55%. Comparing base (ce0547a) to head (8cfd347).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1091      +/-   ##
==========================================
- Coverage   97.55%   97.55%   -0.01%     
==========================================
  Files         355      355              
  Lines        8358     8355       -3     
==========================================
- Hits         8154     8151       -3     
  Misses        204      204              

Files with missing lines	Coverage Δ
app/services/loader.rb	100.00% <ø> (ø)
app/services/normalizer.rb	100.00% <ø> (ø)
app/services/processor.rb	100.00% <ø> (ø)

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