3D-Modelle Ordner + Dateianhang im Kalkulator

frontend/src/tools/dateien.jsx

@@ -192,6 +192,11 @@ export default function Dateien({ toast, mobile }) {
 
   useEffect(()=>{load();},[load]);
 
+  // "3D-Modelle" Ordner beim ersten Laden automatisch anlegen
+  useEffect(()=>{
+    api('/tools/dateien/ensure-folder',{body:{name:'3D-Modelle'}}).catch(()=>{});
+  },[]);
+
   const doUpload = async file => {
     if (!file) return;
     setUploading(true);

frontend/src/tools/kalkulator3d.jsx

@@ -2,6 +2,8 @@ import { useConfirm } from '../confirm.jsx';
 import { useState, useMemo, useEffect, useRef } from 'react';
 import { api, S } from '../lib.js';
 
+const MODEL_EXTENSIONS = ['.stl','.3mf','.f3d','.step','.stp','.obj','.iges','.igs','.fcstd','.amf','.scad'];
+
 const DEFAULTS = {
   materialpreis_pro_rolle: 10,    // €/Rolle (1 kg = 1000 g → 0.01 €/g)
   stromverbrauch_kw: 0.15,
@@ -138,7 +140,9 @@ export default function Kalkulator3D({ toast, editData, onEditDone, mobile, setA
   const [bemerkung, setBemerkung] = useState(editData?.bemerkung ?? '');
   const [image,     setImage]     = useState(editData?.image     ?? null);
   const [saving,    setSaving]    = useState(false);
-  const fileRef = useRef(null);
+  const [modelFiles, setModelFiles] = useState([]); // Array von File-Objekten
+  const fileRef    = useRef(null);
+  const modelFileRef = useRef(null);
   const sv = (k, v) => setVars(p => ({ ...p, [k]: v }));
 
   const calc = useMemo(() => {
@@ -177,12 +181,36 @@ export default function Kalkulator3D({ toast, editData, onEditDone, mobile, setA
         preis_normal:       calc.grund * 1.5,
         preis_auftrag:      calc.grund * 2.5,
         image, bemerkung };
+
       if (editData?.id) {
         await api(`/tools/kalkulator3d/${editData.id}`, { method:'PUT', body:payload });
         toast('Aktualisiert ✓'); onEditDone?.();
       } else {
         await api('/tools/kalkulator3d', { body:payload });
-        toast('Gespeichert ✓'); setName(''); setBemerkung(''); setImage(null);
+        // 3D-Dateien hochladen wenn vorhanden
+        if (modelFiles.length > 0) {
+          try {
+            // 1. "3D-Modelle" Basisordner sicherstellen
+            const base = await api('/tools/dateien/ensure-folder', { body: { name: '3D-Modelle' } });
+            // 2. Unterordner mit Modellnamen anlegen
+            const sub  = await api('/tools/dateien/ensure-folder', { body: { name: name.trim(), parent_id: base.id } });
+            // 3. Dateien hochladen
+            const form = new FormData();
+            form.append('folder_id', sub.id);
+            for (const f of modelFiles) form.append('files', f);
+            await fetch('/api/tools/dateien/upload-3d', {
+              method: 'POST',
+              headers: { Authorization: `Bearer ${localStorage.getItem('sk_token')}` },
+              body: form,
+            });
+            toast(`Gespeichert ✓ · ${modelFiles.length} Datei(en) in 3D-Modelle/${name.trim()} abgelegt`);
+          } catch {
+            toast('Gespeichert ✓ (Datei-Upload fehlgeschlagen)', 'error');
+          }
+        } else {
+          toast('Gespeichert ✓');
+        }
+        setName(''); setBemerkung(''); setImage(null); setModelFiles([]);
         setActive?.('kalkulator3d-saved');
       }
     } catch(e) { toast(e.message, 'error'); } finally { setSaving(false); }
@@ -340,6 +368,50 @@ export default function Kalkulator3D({ toast, editData, onEditDone, mobile, setA
           )}
         </div>
 
+        {/* 3D-Modelldateien – nur beim Neuanlegen */}
+        {!editData?.id && (
+          <div style={{ marginBottom:14 }}>
+            <label style={{ ...S.head, display:'block', marginBottom:6 }}>
+              3D-DATEIEN (optional) – werden in 3D-Modelle/{name.trim()||'…'} abgelegt
+            </label>
+            <input ref={modelFileRef} type="file" multiple
+              accept={MODEL_EXTENSIONS.join(',')}
+              onChange={e => setModelFiles(Array.from(e.target.files||[]))}
+              style={{ display:'none' }} />
+            {modelFiles.length > 0 ? (
+              <div style={{ background:'rgba(255,255,255,0.03)', border:'1px solid rgba(255,255,255,0.1)',
+                borderRadius:8, padding:10 }}>
+                {modelFiles.map((f,i) => (
+                  <div key={i} style={{ display:'flex', alignItems:'center', justifyContent:'space-between',
+                    padding:'4px 0', borderBottom: i<modelFiles.length-1 ? '1px solid rgba(255,255,255,0.05)' : 'none' }}>
+                    <span style={{ color:'rgba(255,255,255,0.7)', fontFamily:'monospace', fontSize:11,
+                      overflow:'hidden', textOverflow:'ellipsis', whiteSpace:'nowrap', maxWidth:'80%' }}>
+                      🖨 {f.name}
+                    </span>
+                    <span style={{ color:'rgba(255,255,255,0.3)', fontFamily:'monospace', fontSize:9, flexShrink:0 }}>
+                      {(f.size/1024/1024).toFixed(1)} MB
+                    </span>
+                  </div>
+                ))}
+                <div style={{ display:'flex', gap:6, marginTop:8 }}>
+                  <button onClick={() => modelFileRef.current?.click()}
+                    style={{ ...S.btn('#4ecdc4', true), flex:1, textAlign:'center', fontSize:11 }}>
+                    + Weitere hinzufügen
+                  </button>
+                  <button onClick={() => setModelFiles([])}
+                    style={{ ...S.btn('#ff6b9d', true), fontSize:11 }}>✕</button>
+                </div>
+              </div>
+            ) : (
+              <button onClick={() => modelFileRef.current?.click()} style={{
+                width:'100%', padding:'16px', background:'rgba(255,255,255,0.03)',
+                border:'1px dashed rgba(255,255,255,0.15)', borderRadius:8,
+                color:'rgba(255,255,255,0.6)', cursor:'pointer', fontFamily:'monospace', fontSize:12,
+              }}>🖨 3D-Dateien anhängen (STL, 3MF, F3D, STEP …)</button>
+            )}
+          </div>
+        )}
+
         <button onClick={save} disabled={saving} style={{
           width:'100%', background:'linear-gradient(135deg,#4ecdc4,#45b7d1)', border:'none',
           borderRadius:8, padding:'12px 0', color:'#0d0d0f',