chore: sync model pricing from OpenRouter API

providers/qwen.toml

@@ -21,8 +21,8 @@ display_name = "Qwen3.6 Max Preview"
 tier = "frontier"
 context_window = 262144
 max_output_tokens = 32768
-input_cost_per_m = 1.30
-output_cost_per_m = 7.80
+input_cost_per_m = 1.04
+output_cost_per_m = 6.24
 supports_tools = true
 supports_vision = false
 supports_streaming = true