fix: resolve all clippy warnings in test files (zero warnings remaining)
- api_auth_test.rs: replace len() > 0 with !is_empty() (3 occurrences)
- api_admin_test.rs: suppress type_complexity on complex tuple Vec annotation
- api_sources_preferred_test.rs: replace assert_eq!(x, false) with assert!(!x)
- api_sources_test.rs: remove needless & on format!() in .uri() calls (5 occurrences)
- api_syntheses_test.rs: remove needless & on format!() in .uri() call
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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oabrivard