chore: Flutter mobile app, CI, and dev tooling

- mobile/: Flutter/Dart merchant mobile app skeleton
- .github/: GitHub Actions CI workflows
- .dockerignore: exclude host node_modules from build context
- .cursorrules: Cursor IDE project rules
- .claude/: Claude Code project settings and launch config

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

mobile/meezi_app/lib/features/table/table_context.dart

@@ -0,0 +1,56 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+class TableContext {
+  const TableContext({
+    this.tableId,
+    this.tableNumber,
+    this.cafeSlug,
+  });
+
+  final String? tableId;
+  final String? tableNumber;
+  final String? cafeSlug;
+
+  TableContext copyWith({
+    String? tableId,
+    String? tableNumber,
+    String? cafeSlug,
+  }) =>
+      TableContext(
+        tableId: tableId ?? this.tableId,
+        tableNumber: tableNumber ?? this.tableNumber,
+        cafeSlug: cafeSlug ?? this.cafeSlug,
+      );
+}
+
+class TableContextNotifier extends StateNotifier<TableContext> {
+  TableContextNotifier() : super(const TableContext());
+
+  void setTable({
+    required String tableId,
+    required String tableNumber,
+    required String cafeSlug,
+  }) {
+    state = TableContext(
+      tableId: tableId,
+      tableNumber: tableNumber,
+      cafeSlug: cafeSlug,
+    );
+  }
+
+  void clear() => state = const TableContext();
+}
+
+final tableContextProvider =
+    StateNotifierProvider<TableContextNotifier, TableContext>((ref) => TableContextNotifier());
+
+/// Extract QR code from full URL or raw token.
+String? parseQrCode(String raw) {
+  final trimmed = raw.trim();
+  if (trimmed.isEmpty) return null;
+  final uri = Uri.tryParse(trimmed);
+  if (uri != null && uri.pathSegments.isNotEmpty) {
+    return uri.pathSegments.last;
+  }
+  return trimmed;
+}