Fix: IPTC metadata displayed with incorrect characters in Studio

Studio now correctly displays IPTC metadata from images that use non-UTF-8 encodings such as Windows-1252. The ImageMetadataResolver previously ignored the IPTC character set declaration (Tag 1:90), causing garbled display of special characters in Studio for images produced by Windows-based tools. The fix adds charset-aware decoding that respects ISO 2022 escape sequences, plain charset name declarations, and the user-defined encoding tag 2:183. When no encoding is declared, a configurable fallback charset is applied (default: ISO-8859-1). The fallback can be changed via the property studio.metadata.image.iptc-fallback-charset — for example, set to windows-1252 to match the behavior of Windows-based image editing tools.

(CMS-18405)