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/checkbox-group.md

@@ -0,0 +1,67 @@
+# CheckboxGroup
+
+A set of checklist buttons to select multiple option from a list.
+
+> Based on [Reka UI CheckboxGroup](https://reka-ui.com/docs/components/checkbox#group-root)
+
+## Key Props
+
+- `items`: as an array of strings or numbers:
+
+## ::component-code
+
+prettier: true
+ignore:
+
+- modelValue
+- items
+  external:
+- items
+- modelValue
+  props:
+  modelValue: - 'System'
+  items: - 'System' - 'Light' - 'Dark'
+
+---
+
+::
+
+You can also pass an array of objects with the following properties:
+
+- `label?: string`{lang="ts-type"}
+- `description?: string`{lang="ts-type"}
+- [`value?: string`{lang="ts-type"}](#value-key)
+- `disabled?: boolean`{lang="ts-type"}
+- `class?: any`{lang="ts-type"}
+- `ui?: { item?: ClassNameValue, container?: ClassNameValue, base?: ClassNameValue, 'indicator'?: ClassNameValue, icon?: ClassNameValue, wrapper?: ClassNameValue, label?: ClassNameValue, description?: ClassNameValue }`{lang="ts-type"}
+
+## ::component-code
+
+ignore:
+
+- modelValue
+- items
+  external:
+- items
+- modelValue
+  externalTypes:
+- CheckboxGroupItem[]
+  props:
+  modelValue: - 'system'
+  items: - label: 'System'
+  description: 'This is the first option.
+- `legend`: to set the legend of the CheckboxGroup.
+- `color`: to change the color of the CheckboxGroup.
+- `variant`: to change the variant of the CheckboxGroup.
+- `size`: to change the size of the CheckboxGroup.
+- `orientation`: to change the orientation of the CheckboxGroup.
+- `indicator`: to change the position or hide the indicator.
+- `disabled`: to disable the CheckboxGroup.
+
+## Usage
+
+```vue
+<UCheckboxGroup
+  <!-- props here -->
+/>
+```