fix(scan): allow slower SANE network discovery

agents/fedeo-device-agent/src/scan/sane.ts

@@ -20,7 +20,9 @@ export const hasSane = () => commandExists("scanimage")
 
 export const listScanners = async () => {
     if (!await hasSane()) return []
-    const result = await runCommand("scanimage", ["-L"], { timeoutMs: 10_000 })
+    // SANE also probes network backends; these can take more than ten seconds
+    // even when the USB scanner is already available.
+    const result = await runCommand("scanimage", ["-L"], { timeoutMs: 30_000 })
     if (result.code !== 0) return []
     return result.stdout.split(/\r?\n/)
         .map((line) => line.trim().match(/^device `([^']+)'/)?.[1])