feat(B-1): add library-query and media-item schemas for movie-list API

[detain]

Summary

• Add schemas/library-query.schema.json (draft 2020-12) for the GET /api/v1/media query parameters
• Add schemas/media-item.schema.json (draft 2020-12) for the browse API item response
• Tag phlix-shared v0.8.0 after merge

Verification

• ./vendor/bin/phpunit green (289 tests, 2546 assertions)
• ./vendor/bin/phpstan analyze green (No errors)
• ./vendor/bin/phpcs --standard=PSR12 src/ clean
• ./vendor/bin/psalm --no-progress green (No errors)
• composer validate --strict clean

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.22%. Comparing base (63d2694) to head (6bebd3c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #10   +/-   ##
=========================================
  Coverage     53.22%   53.22%           
  Complexity      353      353           
=========================================
  Files            34       34           
  Lines          1084     1084           
=========================================
  Hits            577      577           
  Misses          507      507           

Flag	Coverage Δ
phpunit	53.22% <ø> (ø)

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