Feat: add gpustack model provider (#4469)

### What problem does this PR solve?

Add GPUStack as a new model provider.
[GPUStack](https://github.com/gpustack/gpustack) is an open-source GPU
cluster manager for running LLMs. Currently, locally deployed models in
GPUStack cannot integrate well with RAGFlow. GPUStack provides both
OpenAI compatible APIs (Models / Chat Completions / Embeddings /
Speech2Text / TTS) and other APIs like Rerank. We would like to use
GPUStack as a model provider in ragflow.

[GPUStack Docs](https://docs.gpustack.ai/latest/quickstart/)

Related issue: https://github.com/infiniflow/ragflow/issues/4064.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)



### Testing Instructions
1. Install GPUStack and deploy the `llama-3.2-1b-instruct` llm, `bge-m3`
text embedding model, `bge-reranker-v2-m3` rerank model,
`faster-whisper-medium` Speech-to-Text model, `cosyvoice-300m-sft` in
GPUStack.
2. Add provider in ragflow settings.
3. Testing in ragflow.

web/src/constants/setting.ts

@@ -72,6 +72,7 @@ export const IconMap = {
   'nomic-ai': 'nomic-ai',
   jinaai: 'jina',
   'sentence-transformers': 'sentence-transformers',
+  GPUStack: 'gpustack',
 };
 
 export const TimezoneList = [

web/src/pages/user-setting/constants.tsx

@@ -31,6 +31,7 @@ export const LocalLlmFactories = [
   'Replicate',
   'OpenRouter',
   'HuggingFace',
+  'GPUStack',
 ];
 
 export enum TenantRole {

web/src/pages/user-setting/setting-model/ollama-modal/index.tsx

@@ -29,6 +29,7 @@ const llmFactoryToUrlMap = {
   OpenRouter: 'https://openrouter.ai/docs',
   HuggingFace:
     'https://huggingface.co/docs/text-embeddings-inference/quick_tour',
+  GPUStack: 'https://docs.gpustack.ai/latest/quickstart',
 };
 type LlmFactory = keyof typeof llmFactoryToUrlMap;
 
@@ -76,6 +77,13 @@ const OllamaModal = ({
       { value: 'speech2text', label: 'sequence2text' },
       { value: 'tts', label: 'tts' },
     ],
+    GPUStack: [
+      { value: 'chat', label: 'chat' },
+      { value: 'embedding', label: 'embedding' },
+      { value: 'rerank', label: 'rerank' },
+      { value: 'speech2text', label: 'sequence2text' },
+      { value: 'tts', label: 'tts' },
+    ],
     Default: [
       { value: 'chat', label: 'chat' },
       { value: 'embedding', label: 'embedding' },