Xiangzhe 2cb1861db6 feat: add SiliconFlow.cn chat completion and embedding support (#5316)
* feat: add SiliconFlow.cn endpoint support and embedding vectors

Chat completion:
- Add endpoint selection dropdown (Global/.com vs China/.cn) to existing
  SiliconFlow provider, following the Z.AI endpoint pattern
- Backend switches API URL based on selected endpoint
- Add /api-url slash command support for endpoint switching

Embeddings:
- Add SiliconFlow as a vector/embedding source (OpenAI-compatible)
- Support both .com and .cn endpoints via siliconflow_endpoint setting
  borrowed from the main connection panel (Vertex AI pattern)
- Superset model list with platform attribution (.cn) markers
- Models: Qwen3-Embedding (0.6B/4B/8B) + BGE/BCE models (.cn only)

* Add filter by models type

* Load embedding models from endpoint

* Improve api-url command declaration

* Support endpoint override in custom-request service

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Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>
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