feat: standardize configuration fields across all evaluation examples

- Add `fixed_ip` field to all 369 JSON files in examples directory
  - Set to `true` for 8 files listed in google_chrome.json multi_apps
  - Set to `false` for remaining 361 files
- Add `possibility_of_env_change` field to 363 JSON files missing this field
  - Set to "low" for newly added fields
  - Preserve existing values (4 medium, 2 high) for 6 files that already had this field

This ensures consistent configuration schema across all evaluation examples
while maintaining backward compatibility with existing settings.

evaluation_examples/examples/chrome/7f52cab9-535c-4835-ac8c-391ee64dc930.json

@@ -60,7 +60,7 @@
         "goto_prefix": "https://www.",
         "category": "class",
         "class_multiObject_search_exist": {
-          "fT28tf":[
+          "fT28tf": [
             "Black",
             "$25 - $60",
             "On sale",
@@ -92,5 +92,7 @@
       }
     ]
   },
-  "proxy": true
+  "proxy": true,
+  "fixed_ip": false,
+  "possibility_of_env_change": "low"
 }