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### What problem does this PR solve? 1. **Fix Global State Pollution in Local Providers (Critical Bug):** - Resolved a severe concurrency and architecture issue in `model_service.go`. Previously, `ListSupportedModels` would permanently overwrite the global provider singleton with a localized URL instance (`driver.NewInstance`). This caused cross-request contamination in multi-tenant environments. - Fixed `CheckProviderConnection` for local models (LM Studio, vLLM, Ollama). It now properly creates a localized driver copy and injects the `base_url` before testing the connection, entirely eliminating the false-positive `missing base URL` error without polluting the global state. 2. **Implement `VolcEngine` Embeddings:** - Fully implemented the `Encode` method for the `volcengine` provider, enabling text embedding capabilities for VolcEngine models. 3. **Enhance Region Validation in `SiliconFlow`:** - Added a strict empty string check (`*apiConfig.Region != ""`) alongside the existing `nil` check when parsing regions. This ensures that if an empty string is passed, the system safely falls back to the `"default"` region, preventing malformed URL requests and `unsupported protocol scheme` errors. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) - [x] New Feature (non-breaking change which adds functionality)