Fix Qwen2.5 1.5B filename pattern

- Changed from wildcard *Q4_K_M.gguf to exact filename
- File is qwen2.5-1.5b-instruct-q4_k_m.gguf (lowercase)
- Wildcard pattern failed due to case sensitivity

app.py

@@ -804,7 +804,7 @@ EXTRACTION_MODELS = {
     "qwen2.5_1.5b": {
         "name": "Qwen2.5 1.5B (128K Context)",
         "repo_id": "Qwen/Qwen2.5-1.5B-Instruct-GGUF",
-        "filename": "*Q4_K_M.gguf",
+        "filename": "qwen2.5-1.5b-instruct-q4_k_m.gguf",
         "max_context": 131072,
         "default_n_ctx": 4096,
         "params_size": "1.5B",