Add nuxt-skills and update auto quotes to use new policy API structure

- Add nuxt-skills (vue, nuxt, nuxt-ui) to .claude/skills/
- Create useCustomerSelection() composable for managing insured/buyer selection
- Create usePolicyApi() composable for policy API operations
- Update auto quote components to use insured/buyer instead of client
- Update vehicle fields: remove valorVehiculo, add market_value, requested_value, rc_limits
- Make chassis_number and engine_number optional
- Update auto quote types and composables to match new API structure
- Update auto quote page to submit to policy API with new structure

.claude/skills/nuxt-ui/components/separator.md

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+# Separator
+
+Separates content horizontally or vertically.
+
+> Based on [Reka UI Separator](https://reka-ui.com/docs/components/separator)
+
+## Key Props
+
+- `orientation`: to change the orientation of the Separator.
+- `label`: to display a label in the middle of the Separator.
+- `icon`: to display an icon in the middle of the Separator.
+- `avatar`: to display an avatar in the middle of the Separator.
+- `color`: to change the color of the Separator.
+- `type`: to change the type of the Separator.
+- `size`: to change the size of the Separator.
+
+## Usage
+
+```vue
+<USeparator
+  <!-- props here -->
+/>
+```