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/chat-messages.md

@@ -0,0 +1,18 @@
+# ChatMessages
+
+Display a list of chat messages, designed to work seamlessly with Vercel AI SDK.
+
+## Key Props
+
+- `messages`: to display a list of chat messages.
+- `status`: to display a visual indicator when the assistant is processing.
+- `user`: to change the [ChatMessage](/docs/components/chat-message) props for `user` messages.
+- `assistant`: to change the [ChatMessage](/docs/components/chat-message) props for `assistant` messages.
+
+## Usage
+
+```vue
+<UChatMessages
+  <!-- props here -->
+/>
+```