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/tree.md

@@ -0,0 +1,40 @@
+# Tree
+
+A tree view component to display and interact with hierarchical data structures.
+
+> Based on [Reka UI Tree](https://reka-ui.com/docs/components/tree)
+
+## Key Props
+
+- `items`: as an array of objects with the following properties:
+
+- `icon?: string`{lang="ts-type"}
+- `label?: string`{lang="ts-type"}
+- `trailingIcon?: string`{lang="ts-type"}
+- `defaultExpanded?: boolean`{lang="ts-type"}
+- `disabled?: boolean`{lang="ts-type"}
+- `slot?: string`{lang="ts-type"}
+- `children?: TreeItem[]`{lang="ts-type"}
+- `onToggle?: (e: TreeItemToggleEvent<TreeItem>) => void`{lang="ts-type"}
+- `onSelect?: (e: TreeItemSelectEvent<TreeItem>) => void`{lang="ts-type"}
+- `class?: any`{lang="ts-type"}
+- `ui?: { item?: ClassNameValue, itemWithChildren?: ClassNameValue, link?: ClassNameValue, linkLeadingIcon?: ClassNameValue, linkLabel?: ClassNameValue, linkTrailing?: ClassNameValue, linkTrailingIcon?: ClassNameValue, listWithChildren?: ClassNameValue }`{lang="ts-type"}
+
+::note
+A unique identifier is required for each item.
+
+- `multiple`: to allow multiple item selections.
+- `nested`: to control whether the Tree is rendered with nested structure or as a flat list.
+- `color`: to change the color of the Tree.
+- `size`: to change the size of the Tree.
+- `disabled`: to prevent any user interaction with the Tree.
+- `virtualize`: to enable virtualization for large lists as a boolean or an object with options like `{ estimateSize: 32, overscan: 12 }`.
+- `slot`:
+
+## Usage
+
+```vue
+<UTree
+  <!-- props here -->
+/>
+```