feat(provider): add AIHubMix as an OpenAI-compatible provider (#24294)

* feat: add AIHubMix provider to providers.json

* fix: add aihubmix to provider_endpoints_support.json for CI check

---------

Co-authored-by: yuneng-jiang <yuneng@berri.ai>

litellm/llms/openai_like/providers.json

@@ -101,5 +101,10 @@
     "param_mappings": {
       "max_completion_tokens": "max_tokens"
     }
+  },
+  "aihubmix": {
+    "base_url": "https://aihubmix.com/v1",
+    "api_key_env": "AIHUBMIX_API_KEY",
+    "api_base_env": "AIHUBMIX_API_BASE"
   }
 }

provider_endpoints_support.json

@@ -193,6 +193,23 @@
         "a2a": false
       }
     },
+    "aihubmix": {
+      "display_name": "AIHubMix (`aihubmix`)",
+      "url": "https://docs.litellm.ai/docs/providers/aihubmix",
+      "endpoints": {
+        "chat_completions": true,
+        "messages": true,
+        "responses": true,
+        "embeddings": true,
+        "image_generations": true,
+        "audio_transcriptions": true,
+        "audio_speech": true,
+        "moderations": true,
+        "batches": false,
+        "rerank": true,
+        "a2a": false
+      }
+    },
     "assemblyai": {
       "display_name": "AssemblyAI (`assemblyai`)",
       "url": "https://docs.litellm.ai/docs/pass_through/assembly_ai",