[BUG] Ollama.rs expects incorrect response from /api/embed

[CAPsMANyo]

Describe the bug
Ollama.rs is hard coded to use the /api/embed endpoint and expects a return formatted like

{
  "embedding": [
    0.5896830558776855,
    0.2319980412721634,
    -0.20815671980381012
    // ... many more floating-point numbers
  ]
}

This is the expected response of the /api/embeddings endpoint, which Ollama has said is deprecated

The actual response from /api/embed is

{
  "model": "nomic-embed-text",
  "embeddings": [
    [
      0.034329344,
      0.059441593,
      -0.16081077,
      "..."
    ]
  ],
  "total_duration": 66893984,
  "load_duration": 17070078,
  "prompt_eval_count": 10
}

Official ollama docs https://docs.ollama.com/api#generate-embeddings

To Reproduce
Attempt to embed with api_type=cocoindex.LlmApiType.OLLAMA,

Expected behavior
Working embedding with native Ollama endpoint

Screenshots

[2025-10-27T16:05:30Z ERROR cocoindex_engine::execution::source_indexer] Error in processing row from flow `repo_embeddings` source `repo` with key: {"requirements.txt"}
    
    Caused by:
        0: Evaluating ForEach op `.for_each.0`
        1: Evaluating in scope with key {"requirements.txt"}
        2: Evaluating ForEach op `.for_each.1`
        3: Evaluating in scope with key {[0, 345)}
        4: Evaluating Transform op `embedding`
        5: Invalid JSON
        6: error decoding response body
        7: missing field `embedding` at line 1 column 9601

CocoIndex Version
0.22.2

Additional context
Add any other context about the problem here.