perf(rpc): fire-and-forget cache writes in links router

Link create / update / delete were awaiting cache work — setCachedLink,
invalidateLinkCache, invalidateAgentContextSnapshotsForOwner — on the
response path. The agent-context invalidation is a Redis SCAN + per-key
Lua-CAS that can fan out to hundreds of ops for active orgs, adding
seconds before the response returns. /links/create p50 was 13.5s in
prod for the busiest API-key caller; this is one of the contributors.

Detach the cache calls and log failures via .catch. The pre-delete
invalidateLinkCache stays awaited because it is load-bearing for cache
consistency (must clear before the row disappears).

Author: izadoesdev

packages/rpc/src/routers/links.ts

@@ -389,13 +389,19 @@ export const linksRouter = {
 						throw rpcError.internal("Failed to create link");
 					}
 
-					await setCachedLink(slug, toCachedLink(newLink)).catch((err) =>
+					setCachedLink(slug, toCachedLink(newLink)).catch((err) =>
 						logger.error(
 							{ slug, linkId: newLink.id, error: String(err) },
 							"Failed to cache link after create"
 						)
 					);
-					await invalidateAgentContextSnapshotsForOwner(organizationId);
+					invalidateAgentContextSnapshotsForOwner(organizationId).catch(
+						(err) =>
+							logger.error(
+								{ organizationId, error: String(err) },
+								"Failed to invalidate agent context snapshots after link create"
+							)
+					);
 
 					return newLink;
 				} catch (error) {
@@ -511,7 +517,7 @@ export const linksRouter = {
 					throw rpcError.notFound("link", input.id);
 				}
 
-				await Promise.all([
+				Promise.all([
 					oldSlug === updatedLink.slug
 						? Promise.resolve()
 						: invalidateLinkCache(oldSlug),
@@ -585,9 +591,14 @@ export const linksRouter = {
 				);
 			}
 
-			// Hard delete the link
 			await context.db.delete(links).where(eq(links.id, input.id));
-			await invalidateAgentContextSnapshotsForOwner(link.organizationId);
+			invalidateAgentContextSnapshotsForOwner(link.organizationId).catch(
+				(err) =>
+					logger.error(
+						{ organizationId: link.organizationId, error: String(err) },
+						"Failed to invalidate agent context snapshots after link delete"
+					)
+			);
 
 			return { success: true };
 		}),