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/content-toc.md

@@ -0,0 +1,18 @@
+# ContentToc
+
+A sticky Table of Contents with automatic active anchor link highlighting.
+
+## Key Props
+
+- `links`: with the `page?.
+- `title`: to change the title of the Table of Contents.
+- `color`: to change the color of the links.
+- `highlight`: to display a highlighted border for the active item.
+
+## Usage
+
+```vue
+<UContentToc
+  <!-- props here -->
+/>
+```