refactor: remove all any types, add strict GraphQL scalar typing

- Add strictScalars: true to codegen.ts with proper scalar mappings
  (Date, Decimal, JSONString, JSON, UUID, BigInt → string/Record)
- Replace all ref<any[]> with proper GraphQL-derived types
- Add type guards for null filtering in arrays
- Fix bugs exposed by typing (locationLatitude vs latitude, etc.)
- Add interfaces for external components (MapboxSearchBox)

This enables end-to-end type safety from GraphQL schema to frontend.

app/pages/clientarea/ai/index.vue

@@ -109,9 +109,9 @@ const handleSend = async () => {
     const content = last?.content?.[0]?.text || last?.content || t('aiAssistants.view.emptyResponse')
     chat.value.push({ role: 'assistant', content })
     scrollToBottom()
-  } catch (e: any) {
+  } catch (e: unknown) {
     console.error('Agent error', e)
-    error.value = e?.message || t('aiAssistants.view.error')
+    error.value = e instanceof Error ? e.message : t('aiAssistants.view.error')
     chat.value.push({ role: 'assistant', content: t('aiAssistants.view.error') })
     scrollToBottom()
   } finally {