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/pin-input.md

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+# PinInput
+
+An input element to enter a pin.
+
+> Based on [Reka UI PinInput](https://reka-ui.com/docs/components/pin-input)
+
+## Key Props
+
+- `type`: to change the input type.
+- `mask`: to treat the input like a password.
+- `otp`: to enable One-Time Password functionality.
+- `length`: to change the amount of inputs.
+- `placeholder`: to set a placeholder text.
+- `color`: to change the ring color when the PinInput is focused.
+- `variant`: to change the variant of the PinInput.
+- `size`: to change the size of the PinInput.
+- `disabled`: to disable the PinInput.
+
+## Usage
+
+```vue
+<UPinInput
+  <!-- props here -->
+/>
+```