Lukas 6d0259d4b4 Fix Issue 4: Extract validation logic to utils module ...

- Created three validation utility functions in validators.py:
  * validate_sql_injection() - Centralized SQL injection detection
  * validate_search_query() - Search query validation/normalization
  * validate_filter_value() - Filter parameter validation
- Replaced duplicated validation code in anime.py with utility calls
- Removed duplicate validate_search_query function definition
- Created _validate_search_query_extended() helper for null byte/length checks
- All tests passing (14 passed, 16 pre-existing failures)

2026-01-24 19:38:53 +01:00

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