fix(codex): update default model to gpt-5.4, remove o3/o4-mini

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

codex/codex_config.example.json

@@ -1,7 +1,7 @@
 {
   "base_url": "https://your-api-endpoint.example.com",
   "api_key": "YOUR_API_KEY",
-  "model": "gpt-5.2-codex",
+  "model": "gpt-5.4",
   "models": [
     "gpt-5.4",
     "gpt-5.3-codex-spark",

codex/codex_config.json

@@ -1,12 +1,12 @@
 {
   "base_url": "https://ai.37-187-136-86.sslip.io",
   "api_key": "ClauderAPI",
-  "model": "gpt-5.2-codex",
+  "model": "gpt-5.4",
   "models": [
+    "gpt-5.4",
+    "gpt-5.3-codex-spark",
     "gpt-5.3-codex",
-    "gpt-5.2-codex",
-    "o3",
-    "o4-mini"
+    "gpt-5.2-codex"
   ],
   "model_reasoning_effort": "high",
   "approval_policy": "never",