Add shared Manifest UI for delivery, quote, and order.

Wire quote/order API clients and routes, then unify list/create/edit behind ManifestList/Form tiles so Lieferungen and Auftrag share one stack.

src/components/manifest/ManifestLines.jsx

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+import { PureComponent } from 'react';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import Stack from '@mui/material/Stack';
+import Table from '@mui/material/Table';
+import TableBody from '@mui/material/TableBody';
+import TableCell from '@mui/material/TableCell';
+import TableContainer from '@mui/material/TableContainer';
+import TableHead from '@mui/material/TableHead';
+import TableRow from '@mui/material/TableRow';
+import AddIcon from '@mui/icons-material/Add';
+import { PanelTile } from '../panels';
+import { LINE_COLUMNS } from './manifestConfig';
+import ManifestFormLine from './ManifestFormLine';
+
+class ManifestLines extends PureComponent {
+  render() {
+    const {
+      lines,
+      saving,
+      linesColor,
+      onLineChange,
+      onAddLine,
+      onRemoveLine,
+      onSave,
+      columns = LINE_COLUMNS,
+    } = this.props;
+
+    return (
+      <PanelTile wide={3} minHeight={280} color={linesColor} title="Artikel">
+        <Stack spacing={1.5}>
+          <TableContainer>
+            <Table size="small" stickyHeader>
+              <TableHead>
+                <TableRow>
+                  {columns.map((col) => (
+                    <TableCell
+                      key={col.id}
+                      align={col.align}
+                      sx={{
+                        width: col.width,
+                        whiteSpace: 'nowrap',
+                        bgcolor: linesColor,
+                      }}
+                    >
+                      {col.label}
+                    </TableCell>
+                  ))}
+                  <TableCell padding="checkbox" sx={{ bgcolor: linesColor }} />
+                </TableRow>
+              </TableHead>
+              <TableBody>
+                {lines.map((line) => (
+                  <ManifestFormLine
+                    key={line.key}
+                    line={line}
+                    columns={columns}
+                    saving={saving}
+                    onChange={onLineChange}
+                    onRemove={onRemoveLine}
+                  />
+                ))}
+              </TableBody>
+            </Table>
+          </TableContainer>
+          <Box sx={{ display: 'flex', gap: 1, alignItems: 'center' }}>
+            <Button
+              size="small"
+              startIcon={<AddIcon />}
+              disabled={saving}
+              onClick={onAddLine}
+            >
+              Zeile hinzufügen
+            </Button>
+            <Box sx={{ flex: 1 }} />
+            <Button
+              variant="contained"
+              size="small"
+              disabled={saving}
+              onClick={onSave}
+            >
+              {saving ? 'Speichern…' : 'Speichern'}
+            </Button>
+          </Box>
+        </Stack>
+      </PanelTile>
+    );
+  }
+}
+
+export default ManifestLines;