feat: add support for JXL, Camera RAW, ICO, TGA, PSD, EXR, HDR image formats

Extends the platform to handle 7 new image format families alongside
the existing AVIF support gap-fill. Uses the established HEIC decoder
pattern (CLI decode → PNG → Sharp) for formats Sharp can't handle
natively: Camera RAW via dcraw_emu/LibRaw, PSD/TGA/EXR/HDR via
ImageMagick. JXL and ICO are Sharp-native. Adds server-side preview
for non-browser-displayable formats and JXL as a new convert output
target. All 27 validateImageBuffer callers updated with filename for
extension-based format detection.

apps/api/src/lib/file-storage.ts

@@ -15,6 +15,20 @@ const SAFE_STORAGE_EXTENSIONS = new Set([
   ".avif",
   ".svg",
   ".pdf",
+  ".heic",
+  ".heif",
+  ".jxl",
+  ".ico",
+  ".dng",
+  ".cr2",
+  ".nef",
+  ".arw",
+  ".orf",
+  ".rw2",
+  ".tga",
+  ".psd",
+  ".exr",
+  ".hdr",
 ]);
 
 let storageReady = false;