feat: link end customers directly to companies

shop/app/admin/companies/[id]/customers/page.tsx

@@ -98,7 +98,7 @@ export default function CompanyCustomersPage() {
     setZip(customer ? customer.zip || '' : '')
     setCity(customer ? customer.city || '' : '')
     setVatId(customer ? customer.vat_id || '' : '')
-    setPartnerId(customer ? customer.partner_id || '' : companyId)
+    setPartnerId(companyId)
     setEmail(customer ? customer.email || '' : '')
     setError(null)
     setIsOpen(true)
@@ -106,15 +106,11 @@ export default function CompanyCustomersPage() {
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
-    if (!partnerId) {
-      setError('Bitte weisen Sie einen Partner zu.')
-      return
-    }
     setLoadingAction(true)
     setError(null)
     try {
       const payload = {
-        partner_id: partnerId,
+        partner_id: companyId,
         company_name: companyName.trim(),
         first_name: firstName.trim() || undefined,
         last_name: lastName.trim() || undefined,
@@ -415,21 +411,14 @@ export default function CompanyCustomersPage() {
               </div>
 
               <div className="space-y-2">
-                <Label htmlFor="cust-partner">Zugeordneter Partner *</Label>
-                <select
+                <Label htmlFor="cust-partner">Zugeordnetes Unternehmen</Label>
+                <Input
                   id="cust-partner"
-                  required
-                  value={partnerId}
-                  onChange={(e) => setPartnerId(e.target.value)}
-                  className="flex h-9 w-full rounded-md border border-slate-200 dark:border-white/10 bg-slate-50 dark:bg-white/5 px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-indigo-500 disabled:cursor-not-allowed disabled:opacity-50 text-slate-900 dark:text-slate-200"
-                >
-                  <option value="" disabled className="bg-white dark:bg-slate-950 text-slate-900 dark:text-white">Partner auswählen...</option>
-                  {partners.map((p) => (
-                    <option key={p.id} value={p.id} className="bg-white dark:bg-slate-950 text-slate-900 dark:text-white">
-                      {p.name} ({p.email})
-                    </option>
-                  ))}
-                </select>
+                  type="text"
+                  disabled
+                  value={company ? company.name : ''}
+                  className="bg-slate-100 dark:bg-white/10 border-slate-200 dark:border-white/10 cursor-not-allowed"
+                />
               </div>
             </div>