Updated config.py to call Qwen2.5-7B-Instruct

config.py

@@ -1,7 +1,8 @@
 # ── LLM Backend ──────────────────────────────────────────────────────────────
 # ── LLM Backend ──────────────────────────────────────────────────────────────
-# Swapped to the official text-generation certified high-availability model
-HF_MODEL = "mistralai/Mistral-7B-Instruct-v0.2"
+─────────────────────────────────────────────────────────
+# Set to a globally maintained, high-throughput serverless instruction model
+HF_MODEL = "Qwen/Qwen2.5-7B-Instruct"
 
 # ── Persistence ──────────────────────────────────────────────────────────────
 # Session is runtime-only. History JSON is written per-session and read for PDF.