feat(android): add attachment config dialog and FJ- scan in registration

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

lib/pages/registration/dialogs/attachment_config_dialog.dart

@@ -0,0 +1,191 @@
+import 'package:flutter/material.dart';
+import 'package:pad_scanner/services/api_service.dart';
+
+class AttachmentConfigDialogResult {
+  final String determination; // 'has' or 'none'
+  final List<AttachmentConfigItemData> items; // empty if 'none'
+
+  const AttachmentConfigDialogResult({
+    required this.determination,
+    required this.items,
+  });
+}
+
+/// Show the attachment configuration dialog for an order.
+///
+/// [categories] — the full active category list from GET /attachment/categories.
+/// [prefillItems] — existing attachment status items (for pre-fill when
+///   determination is already 'has' due to earlier attachment arrival).
+/// [erpQuantity] — default expected_qty per selected type.
+Future<AttachmentConfigDialogResult?> showAttachmentConfigDialog({
+  required BuildContext context,
+  required String zongpaiNo,
+  required List<AttachmentCategoryData> categories,
+  required List<AttachmentStatusItemData> prefillItems,
+  required int erpQuantity,
+}) {
+  return showDialog<AttachmentConfigDialogResult>(
+    context: context,
+    barrierDismissible: false,
+    builder: (ctx) => _AttachmentConfigDialog(
+      zongpaiNo: zongpaiNo,
+      categories: categories,
+      prefillItems: prefillItems,
+      erpQuantity: erpQuantity,
+    ),
+  );
+}
+
+class _AttachmentConfigDialog extends StatefulWidget {
+  final String zongpaiNo;
+  final List<AttachmentCategoryData> categories;
+  final List<AttachmentStatusItemData> prefillItems;
+  final int erpQuantity;
+
+  const _AttachmentConfigDialog({
+    required this.zongpaiNo,
+    required this.categories,
+    required this.prefillItems,
+    required this.erpQuantity,
+  });
+
+  @override
+  State<_AttachmentConfigDialog> createState() =>
+      _AttachmentConfigDialogState();
+}
+
+class _AttachmentConfigDialogState extends State<_AttachmentConfigDialog> {
+  late Map<int, bool> _selected; // category_id → checked
+  late Map<int, TextEditingController> _controllers; // category_id → qty
+
+  @override
+  void initState() {
+    super.initState();
+    _selected = {};
+    _controllers = {};
+    final prefillSet = <int>{};
+    for (final item in widget.prefillItems) {
+      _selected[item.categoryId] = true;
+      prefillSet.add(item.categoryId);
+    }
+    for (final cat in widget.categories) {
+      if (!_selected.containsKey(cat.id)) {
+        _selected[cat.id] = prefillSet.contains(cat.id);
+      }
+      final ctrl = TextEditingController(
+        text: prefillSet.contains(cat.id)
+            ? widget.prefillItems
+                  .firstWhere((i) => i.categoryId == cat.id)
+                  .expectedQty
+                  .toString()
+            : widget.erpQuantity.toString(),
+      );
+      _controllers[cat.id] = ctrl;
+    }
+  }
+
+  @override
+  void dispose() {
+    for (final ctrl in _controllers.values) {
+      ctrl.dispose();
+    }
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final hasAnyChecked = _selected.values.any((v) => v);
+
+    return AlertDialog(
+      title: Text('${widget.zongpaiNo} — 附件配置'),
+      content: SizedBox(
+        width: 500,
+        child: SingleChildScrollView(
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              const Text(
+                '请勾选本订单携带的附件类型，并确认每种数量：',
+                style: TextStyle(fontSize: 13),
+              ),
+              const SizedBox(height: 8),
+              ...widget.categories.map(
+                (cat) => CheckboxListTile(
+                  dense: true,
+                  title: Text(cat.name, style: const TextStyle(fontSize: 14)),
+                  subtitle: Row(
+                    children: [
+                      const Text('应到: ', style: TextStyle(fontSize: 12)),
+                      SizedBox(
+                        width: 80,
+                        child: TextField(
+                          controller: _controllers[cat.id],
+                          keyboardType: TextInputType.number,
+                          enabled: _selected[cat.id] == true,
+                          style: const TextStyle(fontSize: 14),
+                          decoration: const InputDecoration(
+                            isDense: true,
+                            contentPadding: EdgeInsets.symmetric(
+                              vertical: 4,
+                              horizontal: 8,
+                            ),
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                  value: _selected[cat.id] ?? false,
+                  onChanged: (v) =>
+                      setState(() => _selected[cat.id] = v ?? false),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context),
+          child: const Text('取消'),
+        ),
+        TextButton(
+          onPressed: () {
+            Navigator.pop(
+              context,
+              AttachmentConfigDialogResult(determination: 'none', items: []),
+            );
+          },
+          child: const Text('无附件'),
+        ),
+        ElevatedButton(
+          onPressed: hasAnyChecked
+              ? () {
+                  final items = <AttachmentConfigItemData>[];
+                  for (final cat in widget.categories) {
+                    if (_selected[cat.id] == true) {
+                      final qty =
+                          int.tryParse(_controllers[cat.id]!.text.trim()) ??
+                          widget.erpQuantity;
+                      items.add(
+                        AttachmentConfigItemData(
+                          categoryId: cat.id,
+                          expectedQty: qty,
+                        ),
+                      );
+                    }
+                  }
+                  Navigator.pop(
+                    context,
+                    AttachmentConfigDialogResult(
+                      determination: 'has',
+                      items: items,
+                    ),
+                  );
+                }
+              : null,
+          child: const Text('确认'),
+        ),
+      ],
+    );
+  }
+}