docs: add GPUStack provider logos to README and documentation

- Add GPUStack logo to provider icons in README.md
- Add GPUStack logo to provider icons in docs/index.md
- Organize provider logos into two lines for better layout

Author: crmne

README.md

@@ -12,6 +12,8 @@
   <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/deepseek-text.svg" alt="DeepSeek" class="logo-small">
   &nbsp;
   <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/gemini-brand-color.svg" alt="Gemini" class="logo-large">
+  <br>
+  <img src="https://raw.githubusercontent.com/gpustack/gpustack/main/docs/assets/gpustack-logo.png" alt="GPUStack" class="logo-medium" height="16">
   &nbsp;
   <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/ollama.svg" alt="Ollama" class="logo-medium">
   <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/ollama-text.svg" alt="Ollama" class="logo-medium">

docs/index.md

@@ -34,6 +34,9 @@ One beautiful API for ChatGPT, Claude, Gemini, and more. Chat, images, embedding
   <div class="provider-logo">
     <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/gemini-brand-color.svg" alt="Gemini" class="logo-large">
   </div>
+  <div class="provider-logo">
+    <img src="https://raw.githubusercontent.com/gpustack/gpustack/main/docs/assets/gpustack-logo.png" alt="GPUStack" class="logo-medium">
+  </div>
   <div class="provider-logo">
     <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/ollama.svg" alt="Ollama" class="logo-medium">
     <img src="https://registry.npmmirror.com/@lobehub/icons-static-svg/latest/files/icons/ollama-text.svg" alt="Ollama" class="logo-medium">