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/collapsible.md

@@ -0,0 +1,21 @@
+# Collapsible
+
+A collapsible element to toggle visibility of its content.
+
+> Based on [Reka UI Collapsible](https://reka-ui.com/docs/components/collapsible)
+
+## Key Props
+
+- `disabled`: to disable the Collapsible.
+
+## Usage
+
+```vue
+<UCollapsible
+  <!-- props here -->
+/>
+```
+
+## Slots
+
+- `#content`