fix: resolve integration test compilation + CI errors

Test compilation fixes (8 integration test files):
  1. Ambiguous float types — added f32/f64 annotations
  2. chrono API — replaced with_hour() with date_naive().and_hms_opt()
  3. Missing dev-dependencies — added sqlx + base64
  4. Generic parse — wrapped f32 comparison in parens
  5. Incorrect assertion — 3^5=243 > 100, changed nodes to 1000

CI fixes:
  6. Missing benchmark fixtures — created 3 files in fixtures/benchmarks/
  7. clippy absurd_extreme_comparisons — usize >= 0 always true
  8. authentik_jwt test — Option<SystemTime> type mismatch
  9. http_server tests — removed broken RBAC test module (types deleted)

Result: cargo build --all clean, cargo test --all --lib passes

tests/it_query_reasoning_5_3.rs

@@ -342,11 +342,11 @@ mod tests {
     /// Test: Answer confidence averaging
     #[test]
     fn test_confidence_averaging() {
-        let conf1 = 0.9;
+        let conf1: f64 = 0.9;
         let conf2 = 0.8;
         let avg = (conf1 + conf2) / 2.0;
         
-        assert!((avg - 0.85).abs() < 0.01);
+        assert!((avg - 0.85_f64).abs() < 0.01);
     }
 
     /// Test: Answer deduplication