feat: add customer profile, VAT alignment, and fix shop auth

Customer Profile:
- Add profile API (GET/PUT /api/v1/shop/profile)
- Add password change endpoint (PUT /api/v1/shop/profile/password)
- Implement full profile page with preferences and password sections
- Add CustomerPasswordChange schema

Shop Authentication Fixes:
- Add Authorization header to all shop account API calls
- Fix orders, order-detail, messages pages authentication
- Add proper redirect to login on 401 responses
- Fix toast message showing noqa comment in shop-layout.js

VAT Calculation:
- Add shared VAT utility (app/utils/vat.py)
- Add VAT fields to Order model (vat_regime, vat_rate, etc.)
- Align order VAT calculation with invoice settings
- Add migration for VAT fields on orders

Validation Framework:
- Fix base_validator.py with missing methods
- Add validate_file, output_results, get_exit_code methods
- Fix validate_all.py import issues

Documentation:
- Add launch-readiness.md tracking OMS status
- Update to 95% feature complete

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/shop/account/addresses.html

@@ -133,6 +133,7 @@
 
         <!-- Modal Panel -->
         <div x-show="showAddressModal"
+             @click.stop
              x-transition:enter="ease-out duration-300"
              x-transition:enter-start="opacity-0 translate-y-4 sm:translate-y-0 sm:scale-95"
              x-transition:enter-end="opacity-100 translate-y-0 sm:scale-100"
@@ -286,6 +287,7 @@
 
         <!-- Modal Panel -->
         <div x-show="showDeleteModal"
+             @click.stop
              x-transition:enter="ease-out duration-300"
              x-transition:enter-start="opacity-0 translate-y-4 sm:translate-y-0 sm:scale-95"
              x-transition:enter-end="opacity-100 translate-y-0 sm:scale-100"