Fertigstellen-Button + drawing_created Status-Flow

- DrawIt: Button "Fertigstellen" unter Objektliste setzt Picture-Status auf drawing_created
- Bild verschwindet danach aus der Annotieren-Ansicht
- GenerateIt: lädt jetzt Directus-Bilder mit status=drawing_created
- GenerateIt: zeigt Bild-Vorschau + Directus-Objekte
- app.py: PATCH-Endpunkt für Pictures + Status-Parameter im GET

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/DrawIt.tsx

@@ -4,6 +4,7 @@ import Topbar from '../components/Topbar'
 import {
   getDirectusPictures, directusAssetUrl, type DirectusPicture,
   getDirectusObjects, createDirectusObject, updateDirectusObject, deleteDirectusObject,
+  updatePictureStatus,
 } from '../api'
 import { useAuth } from '../context/AuthContext'
 import type { DirectusObject, Selection, CanvasObject } from '../types'
@@ -38,6 +39,7 @@ export default function DrawIt() {
   const [mode, setMode] = useState<'rect' | 'polygon'>('polygon')
   const [hasSelection, setHasSelection] = useState(false)
   const [saving, setSaving] = useState(false)
+  const [finishing, setFinishing] = useState(false)
   const [status, setStatus] = useState('')
   const [statusError, setStatusError] = useState(false)
 
@@ -106,6 +108,22 @@ export default function DrawIt() {
     }
   }
 
+  const finishPicture = async () => {
+    if (!currentPicture || !token) return
+    setFinishing(true)
+    try {
+      await updatePictureStatus(currentPicture.id, 'drawing_created', token)
+      setPictureList(prev => prev.filter(p => p.id !== currentPicture.id))
+      setCurrentIndex(i => Math.max(0, i - 1))
+      setObjects([])
+      showStatus('Bild fertiggestellt.')
+    } catch (e) {
+      showStatus(e instanceof Error ? e.message : 'Fehler.', true)
+    } finally {
+      setFinishing(false)
+    }
+  }
+
   const saveNoteEdit = async () => {
     if (!editingNotes || !token) return
     try {
@@ -220,6 +238,19 @@ export default function DrawIt() {
               </div>
             )}
           </div>
+
+          {objects.length > 0 && (
+            <div className="sidebar-panel">
+              <button
+                className="btn-primary btn-sm btn-block"
+                onClick={finishPicture}
+                disabled={finishing}
+                style={{ background: 'var(--success, #16a34a)' }}
+              >
+                {finishing ? 'Wird fertiggestellt…' : '✅ Fertigstellen'}
+              </button>
+            </div>
+          )}
         </aside>
 
         {/* Center: Canvas */}