fix(studio): use endswith for mmproj F16 variant selection (#5184)

"f16" in filename matched BF16 files because "bf16" contains "f16"
as a substring. Switch to endswith("-f16.gguf") for an exact match.

studio/backend/core/inference/llama_cpp.py

@@ -1339,7 +1339,7 @@ class LlamaCppBackend:
             # Prefer F16 variant
             target = None
             for f in mmproj_files:
-                if "f16" in f.lower():
+                if f.lower().endswith("-f16.gguf"):
                     target = f
                     break
             if target is None: