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/user.md

@@ -0,0 +1,20 @@
+# User
+
+Display user information with name, description and avatar.
+
+## Key Props
+
+- `name`: to display a name for the user.
+- `description`: to display a description for the user.
+- `avatar`: to display an [Avatar](/docs/components/avatar) component.
+- `chip`: to display a [Chip](/docs/components/chip) component.
+- `size`: to change the size of the user avatar and text.
+- `orientation`: to change the orientation.
+
+## Usage
+
+```vue
+<UUser
+  <!-- props here -->
+/>
+```