feat(providers): add OpenAI API provider option

hermes_cli/models.py

@@ -199,6 +199,16 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "gpt-4o",
         "gpt-4o-mini",
     ],
+    "openai-api": [
+        "gpt-5.5",
+        "gpt-5.4",
+        "gpt-5.4-mini",
+        "gpt-5.4-nano",
+        "gpt-5-mini",
+        "gpt-4.1",
+        "gpt-4o",
+        "gpt-4o-mini",
+    ],
     "openai-codex": _codex_curated_models(),
     "xai-oauth": _xai_curated_models(),
     "copilot-acp": [
@@ -928,6 +938,7 @@ CANONICAL_PROVIDERS: list[ProviderEntry] = [
     ProviderEntry("lmstudio",       "LM Studio",                "LM Studio (local desktop app with built-in model server)"),
     ProviderEntry("anthropic",      "Anthropic",                "Anthropic (Claude models — API key or Claude Code)"),
     ProviderEntry("openai-codex",   "OpenAI Codex",             "OpenAI Codex"),
+    ProviderEntry("openai-api",     "OpenAI API",               "OpenAI API (api.openai.com, API key)"),
     ProviderEntry("alibaba",        "Qwen Cloud",               "Qwen Cloud / DashScope Coding (Qwen + multi-provider)"),
     ProviderEntry("xai-oauth",      "xAI Grok OAuth (SuperGrok / Premium+)", "xAI Grok OAuth (SuperGrok / Premium+)"),
     ProviderEntry("xiaomi",         "Xiaomi MiMo",              "Xiaomi MiMo (MiMo-V2.5 and V2 models — pro, omni, flash)"),