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/stepper.md

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+# Stepper
+
+A set of steps that are used to indicate progress through a multi-step process.
+
+> Based on [Reka UI Stepper](https://reka-ui.com/docs/components/stepper)
+
+## Key Props
+
+- `items`: as an array of objects with the following properties:
+
+- `title?: string`{lang="ts-type"}
+- `description?: AvatarProps`{lang="ts-type"}
+- `content?: string`{lang="ts-type"}
+- `icon?: string`{lang="ts-type"}
+- `value?: string | number`{lang="ts-type"}
+- `disabled?: boolean`{lang="ts-type"}
+- [`slot?: string`{lang="ts-type"}](#with-custom-slot)
+- `class?: any`{lang="ts-type"}
+- `ui?: { item?: ClassNameValue, container?: ClassNameValue, trigger?: ClassNameValue, indicator?: ClassNameValue, icon?: ClassNameValue, separator?: ClassNameValue, wrapper?: ClassNameValue, title?: ClassNameValue, description?: ClassNameValue }`{lang="ts-type"}
+
+## ::component-code
+
+ignore:
+
+- items
+- class
+  external:
+- items
+  externalTypes:
+- StepperItem[]
+  props:
+  items: - title: 'Address'
+  description: 'Add your address here'
+  icon: 'i-lucide-house' - title: 'Shipping'
+  description: 'Set your preferred shipping method'
+  icon: 'i-lucide-truck' - title: 'Checkout'
+  description: 'Confirm your order'
+  class: 'w-full'
+
+---
+
+::
+
+::note
+Click on the items to navigate through the steps.
+
+- `color`: to change the color of the Stepper.
+- `size`: to change the size of the Stepper.
+- `orientation`: to change the orientation of the Stepper.
+- `disabled`: to disable navigation through the steps.
+- `slot`:
+
+## Usage
+
+```vue
+<UStepper
+  <!-- props here -->
+/>
+```
+
+## Slots
+
+- `#content`