Add UI components for Feed and Item displays, including SVG resources

- Introduced FeedCard and FieldShow scenes with corresponding GDScript files for managing feed and item display.
- Added SVG resources for banana and baseball items.
- Updated ItemStore to include mappings for item types and names in Chinese.
- Enhanced FieldShow and ItemShow scripts to dynamically update UI elements based on exported properties.
- Implemented a new Feed class for structured feed data handling.

scripts/Tools/ItemStore.gd

@@ -0,0 +1,15 @@
+@tool
+class_name ItemStore
+
+enum ItemType {
+	BASEBALL,
+	BASKETBALL
+}
+static var nameMap = {
+	ItemType.BASEBALL: "棒球",
+	ItemType.BASKETBALL: "篮球"
+}
+static var idMap = {
+	ItemType.BASEBALL: "baseball",
+	ItemType.BASKETBALL: "basketball"
+}