feat(oai refactor): Replace openai_api with entrypoints/openai (#7351)

Co-authored-by: Jin Pan <jpan236@wisc.edu>

docs/backend/openai_api_embeddings.ipynb

@@ -64,11 +64,14 @@
     "text = \"Once upon a time\"\n",
     "\n",
     "curl_text = f\"\"\"curl -s http://localhost:{port}/v1/embeddings \\\n",
+    "  -H \"Content-Type: application/json\" \\\n",
     "  -d '{{\"model\": \"Alibaba-NLP/gte-Qwen2-1.5B-instruct\", \"input\": \"{text}\"}}'\"\"\"\n",
     "\n",
-    "text_embedding = json.loads(subprocess.check_output(curl_text, shell=True))[\"data\"][0][\n",
-    "    \"embedding\"\n",
-    "]\n",
+    "result = subprocess.check_output(curl_text, shell=True)\n",
+    "\n",
+    "print(result)\n",
+    "\n",
+    "text_embedding = json.loads(result)[\"data\"][0][\"embedding\"]\n",
     "\n",
     "print_highlight(f\"Text embedding (first 10): {text_embedding[:10]}\")"
    ]
@@ -152,6 +155,7 @@
     "input_ids = tokenizer.encode(text)\n",
     "\n",
     "curl_ids = f\"\"\"curl -s http://localhost:{port}/v1/embeddings \\\n",
+    "  -H \"Content-Type: application/json\" \\\n",
     "  -d '{{\"model\": \"Alibaba-NLP/gte-Qwen2-1.5B-instruct\", \"input\": {json.dumps(input_ids)}}}'\"\"\"\n",
     "\n",
     "input_ids_embedding = json.loads(subprocess.check_output(curl_ids, shell=True))[\"data\"][\n",

docs/backend/openai_api_vision.ipynb

@@ -67,6 +67,7 @@
     "\n",
     "curl_command = f\"\"\"\n",
     "curl -s http://localhost:{port}/v1/chat/completions \\\\\n",
+    "  -H \"Content-Type: application/json\" \\\\\n",
     "  -d '{{\n",
     "    \"model\": \"Qwen/Qwen2.5-VL-7B-Instruct\",\n",
     "    \"messages\": [\n",

docs/backend/vlm_query.ipynb

@@ -36,7 +36,7 @@
     "import requests\n",
     "from PIL import Image\n",
     "\n",
-    "from sglang.srt.openai_api.protocol import ChatCompletionRequest\n",
+    "from sglang.srt.entrypoints.openai.protocol import ChatCompletionRequest\n",
     "from sglang.srt.conversation import chat_templates\n",
     "\n",
     "image = Image.open(\n",