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/file-upload.md

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+# FileUpload
+
+An input element to upload files.
+
+## Key Props
+
+- `multiple`: to allow multiple files to be selected.
+- `dropzone`: to enable/disable the droppable area.
+- `interactive`: to enable/disable the clickable area.
+- `accept`: to specify the allowed file types for the input.
+- `label`: to set the label of the FileUpload.
+- `description`: to set the description of the FileUpload.
+- `icon`: to set the icon of the FileUpload.
+- `color`: to change the color of the FileUpload.
+- `variant`: to change the variant of the FileUpload.
+- `size`: to change the size of the FileUpload.
+
+## Usage
+
+```vue
+<UFileUpload
+  <!-- props here -->
+/>
+```
+
+## Slots
+
+- `#actions`