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/routes/user-files.ts

@@ -176,7 +176,7 @@ export async function userFileRoutes(app: FastifyInstance): Promise<void> {
       if (buffer.length === 0) continue;
 
       // Validate image
-      const validation = await validateImageBuffer(buffer);
+      const validation = await validateImageBuffer(buffer, part.filename);
       if (!validation.valid) {
         return reply.status(400).send({
           error: `Invalid file "${part.filename}": ${validation.reason}`,
@@ -503,7 +503,7 @@ export async function userFileRoutes(app: FastifyInstance): Promise<void> {
     }
 
     // Validate the image
-    const validation = await validateImageBuffer(fileBuffer);
+    const validation = await validateImageBuffer(fileBuffer, filename);
     if (!validation.valid) {
       return reply.status(400).send({
         error: `Invalid file: ${validation.reason}`,