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

fixtures/benchmarks/json-output.json

@@ -0,0 +1,28 @@
+{
+  "results": [
+    {
+      "id": "chunk-abc123",
+      "level": "L1",
+      "score": 0.95,
+      "text": "Kubernetes uses port 8080 for API server",
+      "source": "transcript://session-001"
+    },
+    {
+      "id": "chunk-def456",
+      "level": "L2",
+      "score": 0.87,
+      "text": "Common debugging pattern for CrashLoopBackOff pods",
+      "source": "transcript://session-002"
+    },
+    {
+      "id": "chunk-ghi789",
+      "level": "R",
+      "score": 0.72,
+      "text": "See kubectl troubleshooting guide section 3.2",
+      "source": "obsidian://poimen-vault/kubectl.md"
+    }
+  ],
+  "total_hits": 127,
+  "search_time_ms": 145,
+  "query": "fix kubernetes port conflict"
+}