perf(frontend): split admin bundles and tighten data fetching

Add next/dynamic lazy loading for database, logs, and settings heavy
modules; migrate access-logs and task-executions to React Query; parallelize
login auth-sources with public config; consolidate users table tooltips;
enable lazy image decoding; and replace barrel @/lib/services imports with
direct module paths.

frontend/lib/utils/error-handling.ts

@@ -1,4 +1,4 @@
-import { isCancelError } from '@/lib/services'
+import { isCancelError } from '@/lib/services/core'
 import { toast } from 'sonner'
 
 /**