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-message.md

@@ -0,0 +1,20 @@
+# ChatMessage
+
+Display a chat message with icon, avatar, and actions.
+
+## Key Props
+
+- `parts`: to display the message content using the AI SDK v5 format.
+- `side`: to display the message on the left or right.
+- `variant`: to change style of the message.
+- `icon`: to display an [Icon](/docs/components/icon) component next to the message.
+- `avatar`: to display an [Avatar](/docs/components/avatar) component next to the message.
+- `actions`: to display actions below the message that will be displayed when hovering over the message.
+
+## Usage
+
+```vue
+<UChatMessage
+  <!-- props here -->
+/>
+```