Adds gpt-5.4-mini and gpt-5.4-nano (#14908)

### What problem does this PR solve?
Includes gpt-5.4-mini and gpt-5.4-nano to the OpenAI model list

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

conf/llm_factories.json

@@ -22,6 +22,20 @@
                     "model_type": "chat",
                     "is_tools": true
                 },
+                {
+                    "llm_name": "gpt-5.4-mini",
+                    "tags": "LLM,CHAT,400k,IMAGE2TEXT",
+                    "max_tokens": 400000,
+                    "model_type": "chat",
+                    "is_tools": true
+                },
+                {
+                    "llm_name": "gpt-5.4-nano",
+                    "tags": "LLM,CHAT,400k,IMAGE2TEXT",
+                    "max_tokens": 400000,
+                    "model_type": "chat",
+                    "is_tools": true
+                },
                 {
                     "llm_name": "gpt-5.2-pro",
                     "tags": "LLM,CHAT,400k,IMAGE2TEXT",

conf/models/openai.json

@@ -26,6 +26,22 @@
         "vision"
       ]
     },
+    {
+      "name": "gpt-5.4-mini",
+      "max_tokens": 400000,
+      "model_types": [
+        "chat",
+        "vision"
+      ]
+    },
+    {
+      "name": "gpt-5.4-nano",
+      "max_tokens": 400000,
+      "model_types": [
+        "chat",
+        "vision"
+      ]
+    },
     {
       "name": "gpt-5.2-pro",
       "max_tokens": 400000,

test/testcases/test_web_api/test_llm_app/test_llm_list_unit.py

@@ -269,7 +269,7 @@ def test_openai_catalog_contains_latest_gpt_models_unit():
         openai_models = json.load(f)["models"]
     model_file_names = {item["name"] for item in openai_models}
 
-    for model_name in ["gpt-5.5", "gpt-5.4"]:
+    for model_name in ["gpt-5.5", "gpt-5.4", "gpt-5.4-mini", "gpt-5.4-nano"]:
         assert model_name in factory_model_names
         assert model_name in model_file_names