feat: 添加GPT-5.3 Codex支持并优化模型配置

- 添加新模型配置并移除重复的atlas配置项。
- 添加对 GPT-5.3 Codex 模型的支持并更新各模型的输入限制和模态配置。

oh-my-opencode.jsonc

@@ -7,6 +7,13 @@
       "model": "cpa-anthropic/claude-opus-4-5",
       "variant": "max"
     },
+    "hephaestus": {
+      "model": "cpa-openai/gpt-5.3-codex",
+      "variant": "xhigh"
+    },
+    "atlas": {
+      "model": "cpa-anthropic/claude-sonnet-4-5"
+    },
     "oracle": {
       "model": "cpa-openai/gpt-5.2",
       "variant": "xhigh"
@@ -31,9 +38,6 @@
     "momus": {
       "model": "cpa-openai/gpt-5.2",
       "variant": "xhigh"
-    },
-    "atlas": {
-      "model": "cpa-anthropic/claude-sonnet-4-5"
     }
   },
   "categories": {