feat(stt): add FunASR / SenseVoice provider (#16473)

### Summary

Adds FunASR as a self-hosted speech-to-text provider through its
OpenAI-compatible `/v1/audio/transcriptions` endpoint.

This is a focused replacement for #15526 by @Rene0422 and relates to
#15448. The unrelated Markdown parser changes from the previous branch
are intentionally removed so this PR contains only the FunASR provider
integration.

- register FunASR as a `SPEECH2TEXT` factory;
- add `FunASRSeq2txt` with `sensevoice` and `http://localhost:8000/v1`
defaults, an optional API key, URL normalization, and inherited
transcription handling;
- wire FunASR into the current local-provider schema with a prefilled
local URL and official documentation link;
- discover the server's `/v1/models` dynamically and expose every
returned model as speech-to-text in the model picker;
- use RAGFlow's existing default provider icon fallback instead of
referencing a missing `funasr` asset;
- list FunASR in the supported-provider documentation;
- add focused backend and frontend regression tests.

### Validation

- focused backend pytest suite -> `7 passed`
- real CPU `funasr-server` + RAGFlow provider smoke test -> discovered
`fun-asr-nano`, `sensevoice`, and `paraformer`; transcribed a real WAV
as `我现在在录一段测试音频` (`10` tokens, `0.504s`)
- `ruff check` and `ruff format --check` on the changed Python files
- `python3 -m py_compile` on the provider and its test
- JSON parse and a semantic assertion for exactly one enabled FunASR
`SPEECH2TEXT` factory
- focused frontend Jest test -> `2 passed`
- ESLint and Prettier on all changed TypeScript files
- `npm run build` -> production build succeeded (`14,181` modules
transformed)
- `git diff --check`

### Deployment

Run FunASR separately and point the RAGFlow provider at it:

```bash
pip install funasr
funasr-server --device cuda --model sensevoice
```

The API key remains optional because the stock local server does not
require authentication. A key can still be supplied when the endpoint is
protected by a gateway.

---------

Signed-off-by: LauraGPT <LauraGPT@users.noreply.github.com>
Co-authored-by: LauraGPT <LauraGPT@users.noreply.github.com>

web/src/constants/llm.ts

@@ -74,6 +74,7 @@ export enum LLMFactory {
   RAGcon = 'RAGcon',
   Perplexity = 'Perplexity',
   NewAPI = 'New API',
+  FunASR = 'FunASR',
 }
 
 // Please lowercase the file name

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

@@ -40,6 +40,7 @@ export const LocalLlmFactories = [
   LLMFactory.ModelScope,
   LLMFactory.VLLM,
   LLMFactory.RAGcon,
+  LLMFactory.FunASR,
 ];
 
 export enum TenantRole {

web/src/pages/user-setting/setting-model/provider-schema/constants.ts

@@ -38,6 +38,7 @@ export const LIST_MODEL_PROVIDERS = new Set<string>([
   LLMFactory.VolcEngine,
   LLMFactory.Xinference,
   LLMFactory.LocalAI,
+  LLMFactory.FunASR,
   LLMFactory.BaiduYiYan,
   LLMFactory.NewAPI,
 

web/src/pages/user-setting/setting-model/provider-schema/field-config/local-llm-configs.test.ts

@@ -0,0 +1,38 @@
+import { LLMFactory } from '@/constants/llm';
+import { LIST_MODEL_PROVIDERS } from '../constants';
+import { LocalLlmConfigs } from './local-llm-configs';
+
+jest.mock('@/components/dynamic-form', () => ({
+  FormFieldType: {
+    Password: 'password',
+    Switch: 'switch',
+    Text: 'text',
+  },
+}));
+
+describe('FunASR local provider configuration', () => {
+  it('uses the model picker backed by the FunASR models endpoint', () => {
+    expect(LIST_MODEL_PROVIDERS.has(LLMFactory.FunASR)).toBe(true);
+  });
+
+  it('registers an optional-key local endpoint with the FunASR default URL', () => {
+    const config = LocalLlmConfigs[LLMFactory.FunASR];
+
+    expect(config).toMatchObject({
+      llmFactory: LLMFactory.FunASR,
+      title: 'FunASR',
+      docLink: 'https://github.com/modelscope/FunASR',
+    });
+    expect(
+      config.fields.find((field) => field.name === 'base_url'),
+    ).toMatchObject({
+      required: true,
+      defaultValue: 'http://localhost:8000/v1',
+    });
+    expect(
+      config.fields.find((field) => field.name === 'api_key'),
+    ).toMatchObject({
+      required: false,
+    });
+  });
+});

web/src/pages/user-setting/setting-model/provider-schema/field-config/local-llm-configs.ts

@@ -42,6 +42,25 @@ export const LocalLlmConfigs: Record<string, ProviderConfig> = {
     undefined,
     'https://inference.readthedocs.io/en/latest/user_guide',
   ),
+  [LLMFactory.FunASR]: buildLocalConfig(
+    LLMFactory.FunASR,
+    'FunASR',
+    ['speech2text'],
+    undefined,
+    false,
+    [
+      {
+        name: 'base_url',
+        label: 'addLlmBaseUrl',
+        type: 'inputSelect',
+        required: true,
+        defaultValue: 'http://localhost:8000/v1',
+        placeholder: 'baseUrlNameMessage',
+        shouldRender: 'hideWhenInstanceExists',
+      },
+    ],
+    'https://github.com/modelscope/FunASR',
+  ),
   [LLMFactory.ModelScope]: buildLocalConfig(
     LLMFactory.ModelScope,
     'ModelScope',