chore: CSP script nonces, deploy health check, dead-code cleanup

Add per-request CSP nonces (drop script unsafe-inline), post-deploy /api/health gate, bump next-auth to beta.32, and remove unused motion/cache/permission helpers.

Co-authored-by: Cursor <[email protected]>

src/lib/redis.ts

@@ -40,17 +40,3 @@ function createRedis(): Redis | null {
 export const redis: Redis | null =
 	globalForRedis.redis !== undefined ? globalForRedis.redis : createRedis();
 if (globalForRedis.redis === undefined) globalForRedis.redis = redis;
-
-export async function withRedis<T>(
-	fallback: () => Promise<T>,
-	redisFn: (client: Redis) => Promise<T>,
-): Promise<T> {
-	if (redis) {
-		try {
-			return await redisFn(redis);
-		} catch {
-			return fallback();
-		}
-	}
-	return fallback();
-}