fix: réorganiser la configuration d'observabilité dans wrangler.jsonc

wrangler.jsonc

@@ -2,9 +2,6 @@
   "$schema": "node_modules/wrangler/config-schema.json",
   "name": "artapi",
   "compatibility_date": "2025-12-13",
-  "observability": {
-    "enabled": true
-  },
   "main": "./.output/server/index.mjs",
   "assets": {
     "binding": "ASSETS",
@@ -22,5 +19,19 @@
       "binding": "CACHE",
       "id": "0158163e35cf4804832a38863aed8ee9",
     }
-  ]
+  ],
+  "observability": {
+    "enabled": true,
+    "logs": {
+      "enabled": true,
+      "head_sampling_rate": 1,
+      "persist": true,
+      "invocation_logs": true
+    },
+    "traces": {
+      "enabled": true,
+      "head_sampling_rate": 1,
+      "persist": true
+    }
+  }
 }