feat : chicken root page , inventory , sale in province

packages/chicken/lib/data/common/constant.dart

@@ -0,0 +1,14 @@
+enum ApiEnvironment {
+  dam(url: 'https://api.dam.rasadyar.net/');
+
+  const ApiEnvironment({required this.url});
+
+  final String url;
+
+  String get baseUrl {
+    switch (this) {
+      case ApiEnvironment.dam:
+        return url;
+    }
+  }
+}