fix(sync): query customers by vowels to avoid crash

shop/lib/actions/companies.ts

@@ -286,14 +286,32 @@ export async function syncCustomersFromLicServer() {
   // 2. Fetch customers for each company
   for (const company of companies) {
     try {
-      const res = await fetch(`${cfg.base_url}/api-v1/partners/${company.id}/customers?pageSize=1000`, {
-        headers: { 'X-Api-Key': cfg.api_key, 'Accept': 'application/json' },
+      // Workaround for LicServer crash on null/empty search parameter:
+      // We query using common vowels/umlauts in parallel and de-duplicate locally.
+      const searchChars = ['a', 'e', 'i', 'o', 'u', 'ä', 'ö', 'ü', 'y']
+      const customerMap = new Map<string, any>()
+
+      await Promise.all(
+        searchChars.map(async char => {
+          try {
+            const res = await fetch(`${cfg.base_url}/api-v1/partners/${company.id}/customers?pageSize=1000&search=${encodeURIComponent(char)}`, {
+              headers: { 'X-Api-Key': cfg.api_key!, 'Accept': 'application/json' },
               signal: AbortSignal.timeout(10_000),
             })
-
             if (res.ok) {
               const result = await res.json()
-        const customers = result.items || []
+              const items = result.items || []
+              for (const c of items) {
+                customerMap.set(c.id, c)
+              }
+            }
+          } catch (e: any) {
+            console.error(`[sync-customers] Error fetching with search=${char} for partner ${company.id}:`, e.message || e)
+          }
+        })
+      )
+
+      const customers = Array.from(customerMap.values())
 
       for (const c of customers) {
         const streetCombined = [c.street, c.houseNumber, c.houseNumberAddon]
@@ -312,9 +330,6 @@ export async function syncCustomersFromLicServer() {
           is_anonymized: false,
         })
       }
-      } else {
-        console.warn(`[sync-customers] Skipping partner ${company.id} due to API status: ${res.status}`)
-      }
     } catch (e: any) {
       console.error(`[sync-customers] Error fetching customers for partner ${company.id}:`, e.message || e)
     }