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/modal.md

@@ -0,0 +1,32 @@
+# Modal
+
+A dialog window that can be used to display a message or request user input.
+
+> Based on [Reka UI Modal](https://reka-ui.com/docs/components/dialog)
+
+## Key Props
+
+- `title`: to set the title of the Modal's header.
+- `description`: to set the description of the Modal's header.
+- `close`: to customize or hide the close button (with `false` value) displayed in the Modal's header.
+- `transition`: to control whether the Modal is animated or not.
+- `overlay`: to control whether the Modal has an overlay or not.
+- `modal`: to control whether the Modal blocks interaction with outside content.
+- `dismissible`: to control whether the Modal is dismissible when clicking outside of it or pressing escape.
+- `scrollable`: to make the Modal's content scrollable within the overlay.
+- `fullscreen`: to make the Modal fullscreen.
+
+## Usage
+
+```vue
+<UModal
+  <!-- props here -->
+/>
+```
+
+## Slots
+
+- `#content`
+- `#header`
+- `#body`
+- `#footer`