chore(sync): update xAI model catalog

providers/xai/models/grok-4.5.toml

@@ -5,12 +5,15 @@ type = "effort"
 values = ["low", "medium", "high"]
 
 [cost]
-input = 2.0
-output = 6.0
+input = 2
+output = 6
 cache_read = 0.5
 
 [[cost.tiers]]
-tier = { size = 200_000 }
-input = 4.0
-output = 12.0
-cache_read = 1.0
+tier = { type = "context", size = 200_000 }
+input = 4
+output = 12
+cache_read = 1
+
+[modalities]
+input = ["text", "image", "pdf"]