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/popover.md

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+# Popover
+
+A non-modal dialog that floats around a trigger element.
+
+> Based on [Reka UI Popover](https://reka-ui.com/docs/components/hover-card)
+
+## Key Props
+
+- `mode`: to change the mode of the Popover.
+- `content`: to control how the Popover content is rendered, like its `align` or `side` for example.
+- `arrow`: to display an arrow on the Popover.
+- `modal`: to control whether the Popover blocks interaction with outside content.
+- `dismissible`: to control whether the Popover is dismissible when clicking outside of it or pressing escape.
+
+## Usage
+
+```vue
+<UPopover
+  <!-- props here -->
+/>
+```
+
+## Slots
+
+- `#content`