Generating tests with HuggingFace leads to 404

### Affected Modules
- [ ] UI
- [ ] EvoSuite
- [x] LLM
- [ ] Kex
- [ ] Other (please specify)

### Bug Description
Attempting to generate tests using a HuggingFace token (with either of the two supported models) results in a 404 error.

### Steps to Reproduce
1. Open any Java class
2. Right-click a method and select **TestSpark**
3. Choose HuggingFace and select one of the two Ollama models
4. Click **Generate** → an IntelliJ error notification appears with a 404 error (no additional details provided)

### Expected Behavior
The test generation process completes successfully.

### Additional Information
According to the [API reference](https://huggingface.co/docs/hub/api) of HuggingFace, the issue could be a missing `api/` in the [URL](https://github.com/JetBrains-Research/TestSpark/blob/b2306f08665ac98aa4d192f6c9a3f0f7ef2a9482/src/main/kotlin/org/jetbrains/research/testspark/tools/llm/generation/hf/HuggingFaceRequestManager.kt#L27)

Start with src/main/kotlin/org/jetbrains/research/testspark/tools/llm/generation/hf/HuggingFaceRequestManager.kt at the URL referenced in the issue. Reproduce generation from a Java method using HuggingFace and each supported Ollama model, then compare the request with the HuggingFace API reference. Done means test generation completes without the 404 notification.

Written by the indexing model from the issue text.