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/index.js

@@ -0,0 +1,13 @@
+export { default as ManifestList } from './ManifestList';
+export { default as ManifestForm } from './ManifestForm';
+export { default as ManifestHeader } from './ManifestHeader';
+export { default as ManifestLines } from './ManifestLines';
+export { default as ManifestFormLine } from './ManifestFormLine';
+export { withManifestId } from './withManifestId';
+export {
+  manifestConfig,
+  LINE_COLUMNS,
+  emptyLine,
+  lineFromApi,
+  buildManifestBody,
+} from './manifestConfig';