fix: EXR/HDR decode failures and batch network timeout

EXR: add ffmpeg fallback when ImageMagick lacks the OpenEXR delegate
(common on macOS Homebrew installs). HDR: force 8-bit depth output to
prevent CLAHE crash (hist_local requires VIPS_FORMAT_UCHAR). Batch:
disable socket timeout and increase server requestTimeout to 30 min
so large AI batches don't get killed by Node.js defaults.

apps/api/src/routes/batch.ts

@@ -37,6 +37,11 @@ export async function registerBatchRoutes(app: FastifyInstance): Promise<void> {
     async (request: FastifyRequest<{ Params: { toolId: string } }>, reply: FastifyReply) => {
       const { toolId } = request.params;
 
+      // Batch processing (especially with AI) can take tens of minutes.
+      // Disable the Node.js HTTP socket timeout so the connection is not
+      // dropped while images are still being processed.
+      request.raw.socket?.setTimeout?.(0);
+
       // Look up the tool config from the registry
       const toolConfig = getToolConfig(toolId);
       if (!toolConfig) {