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/os/3ce045a0-877b-42aa-8d2c-b4a863336ab8.json

@@ -19,7 +19,7 @@
   "related_apps": [
     "os"
   ],
- "evaluator": {
+  "evaluator": {
     "func": [
       "check_include_exclude",
       "check_include_exclude"
@@ -32,7 +32,7 @@
         "shell": true
       },
       {
-        "type": "vm_command_line", 
+        "type": "vm_command_line",
         "command": "ZOOM_ENABLED=$(timeout 10 gsettings get org.gnome.desktop.a11y.applications screen-magnifier-enabled 2>/dev/null | grep -c true); ZOOM_FACTOR=$(timeout 10 gsettings get org.gnome.desktop.a11y.magnifier mag-factor 2>/dev/null | grep -oE '[0-9]+\\.[0-9]+' | head -1); if [ \"$ZOOM_ENABLED\" -gt 0 ] && [ -n \"$ZOOM_FACTOR\" ] && [ \"$(echo \"$ZOOM_FACTOR > 1.1\" | bc -l 2>/dev/null || echo 0)\" = \"1\" ]; then echo \"Zoom enabled with magnification (factor: $ZOOM_FACTOR)\"; else echo \"No zoom magnification enabled\"; fi",
         "shell": true
       }
@@ -51,7 +51,7 @@
         }
       },
       {
-        "type": "rule", 
+        "type": "rule",
         "rules": {
           "include": [
             "Zoom enabled with magnification"
@@ -64,5 +64,7 @@
       }
     ]
   },
-  "proxy": false
-}
+  "proxy": false,
+  "fixed_ip": false,
+  "possibility_of_env_change": "low"
+}