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/button.md

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+# Button
+
+A button element that can act as a link or trigger an action.
+
+## Key Props
+
+- `label`: to set the label of the Button.
+- `color`: to change the color of the Button.
+- `variant`: to change the variant of the Button.
+- `size`: to change the size of the Button.
+- `icon`: to show an [Icon](/docs/components/icon) inside the Button.
+- `avatar`: to show an [Avatar](/docs/components/avatar) inside the Button.
+- `loading`: to show a loading icon and disable the Button.
+- `disabled`: to disable the Button.
+- `class`: to override the base styles of the Button.
+- `ui`: to override the slots styles of the Button.
+
+## Usage
+
+```vue
+<UButton
+  <!-- props here -->
+/>
+```