Fix: bruk sql.json() for JSONB payload i job_queue

JSON.stringify + ::jsonb via postgres-biblioteket lagret payload som
dobbelt-escaped string i stedet for JSONB-objekt. Workeren fant ikke
message_id i den resulterende strengen.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/routes/api/ai/process/+server.ts

@@ -30,17 +30,18 @@ export const POST: RequestHandler = async ({ request, locals }) => {
 	if (!msg) error(404, 'Melding ikke funnet');
 
 	// Opprett jobb i køen
+	const payload = {
+		message_id,
+		action: action ?? 'fix_text',
+		prompt_override: prompt_override ?? null,
+		model: model ?? null
+	};
 	const [job] = await sql`
 		INSERT INTO job_queue (workspace_id, job_type, payload, priority)
 		VALUES (
 			${workspace.id},
 			'ai_text_process',
-			${JSON.stringify({
-				message_id,
-				action: action ?? 'fix_text',
-				prompt_override: prompt_override ?? null,
-				model: model ?? null
-			})}::jsonb,
+			${sql.json(payload)},
 			10
 		)
 		RETURNING id, status, created_at