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/avatar.md

@@ -0,0 +1,19 @@
+# Avatar
+
+An img element with fallback and Nuxt Image support.
+
+## Key Props
+
+- `src`: to set the image URL.
+- `size`: to set the size of the Avatar.
+- `icon`: to display a fallback [Icon](/docs/components/icon).
+- `text`: to display a fallback text.
+- `chip`: to display a chip around the Avatar.
+
+## Usage
+
+```vue
+<UAvatar
+  <!-- props here -->
+/>
+```