迁移 Flutter 端与训练脚本，模型/训练产物移出 git（遵循纯代码约定）

flutter_app/test/coordinate_mapper_test.dart

@@ -0,0 +1,49 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:observer/detection/coordinate_mapper.dart';
+
+void main() {
+  test('rotation90_center_mapsToViewCenter', () {
+    final rect = CoordinateMapper.mapToView(
+      0.4, 0.4, 0.6, 0.6,
+      90, 1280, 720, 1080, 1920,
+    );
+    expect(rect.centerX, closeTo(540, 1));
+    expect(rect.centerY, closeTo(960, 1));
+  });
+
+  test('rotation90_corner_appliesFitCenterOffset', () {
+    final rect = CoordinateMapper.mapToView(
+      0, 0, 0.5, 0.5,
+      90, 1280, 720,
+      1080, 2400,
+    );
+    expect(rect.left, closeTo(540, 1));
+    expect(rect.top, closeTo(240, 1));
+    expect(rect.right, closeTo(1080, 1));
+    expect(rect.bottom, closeTo(1200, 1));
+  });
+
+  test('rotation0_keepsCoordinates', () {
+    final rect = CoordinateMapper.mapToView(
+      0.2, 0.3, 0.5, 0.7,
+      0, 1080, 1920,
+      1080, 1920,
+    );
+    expect(rect.left, closeTo(216, 1));
+    expect(rect.top, closeTo(576, 1));
+    expect(rect.right, closeTo(540, 1));
+    expect(rect.bottom, closeTo(1344, 1));
+  });
+
+  test('rotation180_flipsBothAxes', () {
+    final rect = CoordinateMapper.mapToView(
+      0.2, 0.2, 0.4, 0.4,
+      180, 1080, 1920,
+      1080, 1920,
+    );
+    expect(rect.left, closeTo(648, 1));
+    expect(rect.top, closeTo(1152, 1));
+    expect(rect.right, closeTo(864, 1));
+    expect(rect.bottom, closeTo(1536, 1));
+  });
+}