fix: add eu-central-2 to the claude-v4.5-haiku cross-region inference map

Author: NitroBoss

backend/app/bedrock.py

@@ -376,6 +376,7 @@
             "ap-northeast-1": "jp",
             "ap-northeast-3": "jp",
             "eu-central-1": "eu",
+            "eu-central-2": "eu",
             "eu-north-1": "eu",
             "eu-west-1": "eu",
             "eu-west-3": "eu",