refactor(shared): animation, l10n, theme 모듈을 core에서 shared로 이동

- core/animation → shared/animation
- core/l10n → shared/l10n
- core/constants/ascii_colors → shared/theme/ascii_colors
- import 경로 업데이트

lib/src/shared/animation/canvas/ascii_canvas_widget.dart

@@ -0,0 +1,79 @@
+import 'package:asciineverdie/src/shared/animation/canvas/ascii_canvas_painter.dart';
+import 'package:asciineverdie/src/shared/animation/canvas/ascii_layer.dart';
+import 'package:asciineverdie/src/shared/theme/ascii_colors.dart';
+import 'package:flutter/material.dart';
+
+/// ASCII Canvas 위젯 (RepaintBoundary 포함)
+///
+/// AsciiCanvasPainter를 감싸는 위젯.
+/// RepaintBoundary로 성능 최적화.
+/// willChange를 애니메이션 상태에 따라 동적 설정.
+/// 테마 인식 색상 자동 적용 (Phase 5).
+class AsciiCanvasWidget extends StatelessWidget {
+  const AsciiCanvasWidget({
+    super.key,
+    required this.layers,
+    this.gridWidth = 60,
+    this.gridHeight = 8,
+    this.backgroundOpacity = 0.5,
+    this.isAnimating = true,
+    this.layerVersion = 0,
+  });
+
+  /// 렌더링할 레이어 목록
+  final List<AsciiLayer> layers;
+
+  /// 그리드 너비 (열 수)
+  final int gridWidth;
+
+  /// 그리드 높이 (행 수)
+  final int gridHeight;
+
+  /// 배경 투명도 (0.0 ~ 1.0, 기본값 0.5 = 50%)
+  final double backgroundOpacity;
+
+  /// 애니메이션 활성 상태 (willChange 최적화용)
+  final bool isAnimating;
+
+  /// 레이어 버전 (변경 감지용, shouldRepaint 최적화)
+  final int layerVersion;
+
+  @override
+  Widget build(BuildContext context) {
+    // 테마 인식 색상 (다크/라이트 모드 자동 전환)
+    final bgColor = AsciiColors.backgroundOf(context);
+    final objColor = AsciiColors.objectOf(context);
+    final posColor = AsciiColors.positiveOf(context);
+    final negColor = AsciiColors.negativeOf(context);
+
+    // 무기 등급 색상 (Phase 9)
+    final uncommonColor = AsciiColors.rarityUncommonOf(context);
+    final rareColor = AsciiColors.rarityRareOf(context);
+    final epicColor = AsciiColors.rarityEpicOf(context);
+    final legendaryColor = AsciiColors.rarityLegendaryOf(context);
+
+    return RepaintBoundary(
+      child: CustomPaint(
+        painter: AsciiCanvasPainter(
+          layers: layers,
+          gridWidth: gridWidth,
+          gridHeight: gridHeight,
+          backgroundColor: bgColor,
+          backgroundOpacity: backgroundOpacity,
+          layerVersion: layerVersion,
+          objectColor: objColor,
+          positiveColor: posColor,
+          negativeColor: negColor,
+          rarityUncommonColor: uncommonColor,
+          rarityRareColor: rareColor,
+          rarityEpicColor: epicColor,
+          rarityLegendaryColor: legendaryColor,
+        ),
+        size: Size.infinite,
+        isComplex: true,
+        // 애니메이션 중일 때만 willChange 활성화
+        willChange: isAnimating,
+      ),
+    );
+  }
+}