Add NAS benchmark results for nfs-csi run

nas-benchmark-2026-01-19.md

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+# NAS Benchmark Results (nfs-csi)
+
+Date: 2026-01-19
+
+## Workload
+- Tool: fio 3.35
+- Pattern: randrw (70% read / 30% write)
+- Block size: 4k
+- I/O depth: 16
+- Jobs: 4
+- Size: 2GiB
+- Runtime: 120s
+- StorageClass: nfs-csi
+- PVC: 10Gi RWX
+
+## Results
+- Read: IOPS=110, BW=441KiB/s (451kB/s), io=51.7MiB
+- Write: IOPS=49, BW=197KiB/s (202kB/s), io=23.1MiB
+
+## Notes
+- fio output reported synchronous I/O with iodepth capped to 1 (psync engine).