fix(api): avoid Unicode tag extraction in compound search

[NishaSharma14]

Match compound tag searches against generated tag slugs instead of extracting translated tag names. This avoids PostgreSQL SQL_ASCII failures when production tag JSON contains escaped Unicode values such as Greek symbols.

Validated with:
./vendor/bin/sail artisan test tests/API/SearchControllerTest.php

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.26%. Comparing base (8681915) to head (70f5430).

Files with missing lines	Patch %	Lines
app/Http/Controllers/API/SearchController.php	91.66%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             development    #1541   +/-   ##
==============================================
  Coverage          80.26%   80.26%           
- Complexity          4481     4483    +2     
==============================================
  Files                293      293           
  Lines              16424    16430    +6     
==============================================
+ Hits               13182    13187    +5     
- Misses              3242     3243    +1     

Flag	Coverage Δ
unittests	80.26% <91.66%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.