Switch deepseek-ocr-vllm.py to stable vLLM (>=0.15.1), drop nightly index

DeepSeek-OCR v1 architecture is in stable vLLM since before 0.15.1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deepseek-ocr-vllm.py

@@ -4,17 +4,11 @@
 #     "datasets>=4.0.0",
 #     "huggingface-hub",
 #     "pillow",
-#     "vllm",
+#     "vllm>=0.15.1",
 #     "tqdm",
 #     "toolz",
 #     "torch",
 # ]
-#
-# [[tool.uv.index]]
-# url = "https://wheels.vllm.ai/nightly/cu129"
-#
-# [tool.uv]
-# prerelease = "allow"
 # ///
 
 """