feat(app): 添加 image_picker 依赖

app/pubspec.yaml

@@ -39,7 +39,8 @@ dependencies:
   # 图表
   fl_chart: ^0.70.0
 
-  # 图片压缩
+  # 图片
+  image_picker: ^1.0.0
   flutter_image_compress: ^2.4.0
 
   # 工具
@@ -70,11 +71,28 @@ flutter:
   uses-material-design: true
 
   fonts:
+    # 设计稿主字体 — 待下载 .ttf 文件，当前系统 sans-serif 回退
+    - family: Nunito
+      fonts:
+        - asset: assets/fonts/Nunito-Regular.ttf
+        - asset: assets/fonts/Nunito-Bold.ttf
+          weight: 700
+        - asset: assets/fonts/Nunito-SemiBold.ttf
+          weight: 600
+    - family: Quicksand
+      fonts:
+        - asset: assets/fonts/Quicksand-Regular.ttf
+        - asset: assets/fonts/Quicksand-Bold.ttf
+          weight: 700
+        - asset: assets/fonts/Quicksand-SemiBold.ttf
+          weight: 600
+    # CJK 中文回退（保留）
     - family: NotoSansSC
       fonts:
         - asset: assets/fonts/NotoSansSC-Regular.ttf
         - asset: assets/fonts/NotoSansSC-Bold.ttf
           weight: 700
+    # 手写装饰字体（保留）
     - family: Caveat
       fonts:
         - asset: assets/fonts/Caveat-Regular.ttf