Validate and add Models to supported model list

[ravi9]

Verify the following GGUF models and add them to the supported model list.
For an unsupported model, create an issue for tracking.

1. Granite 4.0 Micro : granite-4.0-micro-Q4_K_M.gguf
2. Qwen 3 4B : Qwen3-4B-Q4_K_M.gguf
3. GPT OSS 20B : gpt-oss-20b-Q4_K_M.gguf
4. Google Gemma 3N E4B : gemma-3n-E4B-it-Q4_K_M.gguf
5. Mistral Small 3.2 24B : Mistral-Small-3.2-24B-Instruct-2506-Q4_K_M.gguf
6. Phi-4 mini instruct Q4_K_M : Phi-4-mini-instruct-Q4_K_M.gguf
7. Gemma 34B it Q4_0 : gemma-3-4b-it-qat-q4_0-gguf
8. Qwen3-VL 2B FP16 (mmproj) : mmproj-F16.gguf
9. Qwen3-VL 2B Q4_K_M (model) : Qwen3-VL-2B-Instruct-Q4_K_M.gguf