feat(home): add configurable cols to services component #3853

Context

The services component grid is hardcoded to 3 columns (md="4"). When the item count doesn't match (e.g. 4 items), the last item sits alone on a new row, breaking visual balance.

Proposal

Add a cols config option to home.services.component.vue:

services: {
  cols: 4, // 2, 3, 4, or 6 — default: 3
  content: [...]
}

Implementation:

• Replace hardcoded md="4" with md="setup.cols ? 12 / setup.cols : 4"
• Validate: cols must divide 12 evenly (2, 3, 4, 6)
• Keep existing responsive behavior (full width on mobile)

Benefit

Allows matching grid layout to content count without orphan items.