Feature: Implement context-aware pricing for product types

Updates pricing logic to use correct price based on product type:
- Updated getEffectivePrice to accept priceType parameter ('base', 'plain', 'personalised')
- Updated toProductDTO to accept and use priceType when computing effective price
- Updated made-to-order pages to use 'personalised' price type
- Updated products catalog pages to use 'plain' price type
- Updated checkout logic to determine price type based on design

Pricing behavior:
- Personalised orders (with design): use personalisedPrice if set, else basePrice
- Plain/blank orders (no design): use plainPrice if set, else basePrice
- Ready-made orders (no design, no plainPrice): use basePrice

All prices now correctly reflect the product variant being purchased.

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

.claude/settings.local.json

@@ -134,7 +134,8 @@
       "Bash(timeout 30 git push origin main --force)",
       "Bash(GIT_TRACE=1 git push origin main --force)",
       "Bash(pkill -f \"node.exe\")",
-      "PowerShell(Stop-Process -Name node -Force -ErrorAction SilentlyContinue)"
+      "PowerShell(Stop-Process -Name node -Force -ErrorAction SilentlyContinue)",
+      "Bash(find \"D:\\\\Craft2Prints\\\\src\\\\app\" -path \"*/\\\\[slug\\\\]/*\" -name \"page.tsx\" | head -10)"
     ]
   }
 }