fix(archive): make cluster.json test fixtures schema-valid

The alex and fritz fixtures used "Flops/s" and "packets/s" as unit bases, which
are not in the enum of unit.schema.json ("F/s" is). They are copied into real
deployments, where an invalid cluster.json only fails at runtime once
main.validate is enabled.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

pkg/archive/testdata/archive/alex/cluster.json

@@ -46,7 +46,7 @@
     {
       "name": "flops_any",
       "unit": {
-        "base": "Flops/s",
+        "base": "F/s",
         "prefix": "G"
       },
       "scope": "hwthread",

pkg/archive/testdata/archive/fritz/cluster.json

@@ -85,7 +85,7 @@
     {
       "name": "flops_any",
       "unit": {
-        "base": "Flops/s",
+        "base": "F/s",
         "prefix": "G"
       },
       "scope": "hwthread",
@@ -118,7 +118,7 @@
     {
       "name": "flops_sp",
       "unit": {
-        "base": "Flops/s",
+        "base": "F/s",
         "prefix": "G"
       },
       "scope": "hwthread",
@@ -150,7 +150,7 @@
     {
       "name": "flops_dp",
       "unit": {
-        "base": "Flops/s",
+        "base": "F/s",
         "prefix": "G"
       },
       "scope": "hwthread",
@@ -327,7 +327,7 @@
     {
       "name": "ib_recv_pkts",
       "unit": {
-        "base": "packets/s"
+        "base": ""
       },
       "scope": "node",
       "aggregation": "sum",
@@ -340,7 +340,7 @@
     {
       "name": "ib_xmit_pkts",
       "unit": {
-        "base": "packets/s"
+        "base": ""
       },
       "scope": "node",
       "aggregation": "sum",