Admin CPU and GPU pages currently hard-filter the brands list client-side as a temporary workaround.

Files with TODO comments:

• src/app/admin/cpus/page.tsx line 80 — only keeps 'Intel', 'AMD', 'Apple'
• src/app/admin/gpus/page.tsx line 81 — only keeps 'Intel', 'AMD', 'NVIDIA'

Action required:

• Add a server-side filter to the brands router/repository that accepts a category (e.g., cpu, gpu) parameter.
• Remove the client-side hard-coded brand filtering.

Requested by @Producdevity — related to PR #375