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/alert.md

@@ -0,0 +1,24 @@
+# Alert
+
+A callout to draw user's attention.
+
+## Key Props
+
+- `title`: to set the title of the Alert.
+- `description`: to set the description of the Alert.
+- `icon`: to show an [Icon](/docs/components/icon).
+- `avatar`: to show an [Avatar](/docs/components/avatar).
+- `color`: to change the color of the Alert.
+- `variant`: to change the variant of the Alert.
+- `close`: to display a [Button](/docs/components/button) to dismiss the Alert.
+- `actions`: to add some [Button](/docs/components/button) actions to the Alert.
+- `orientation`: to change the orientation of the Alert.
+- `class`: to override the base styles of the Alert.
+
+## Usage
+
+```vue
+<UAlert
+  <!-- props here -->
+/>
+```