chore: 初始化脚手架 — sunny_mochi 企业级 Flutter 模板

Core 基础设施：Flavor 三包体系、Drift+SQLCipher 加密数据库 7 拦截器 Dio 网络栈、CrashReporter 崩溃日志、Sealed Failure 错误体系 5 色板主题系统、Auth 认证骨架（Clean Architecture）、Dev Panel、Mock Adapter 通过验证：flutter analyze（0 errors）、flutter test（全绿）、staging APK 74.8MB
2026-05-14 12:51:05 +08:00
commit 61017f1c39
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+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter/material.dart';
+
+/// 用户头像，支持网络图片 + 首字母 fallback。
+class AvatarWidget extends StatelessWidget {
+  const AvatarWidget({
+    super.key,
+    this.url,
+    this.name,
+    this.size = 40,
+  });
+
+  final String? url;
+  final String? name;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final radius = size / 2;
+
+    if (url != null && url!.isNotEmpty) {
+      return CachedNetworkImage(
+        imageUrl: url!,
+        imageBuilder: (_, img) => CircleAvatar(
+          radius: radius,
+          backgroundImage: img,
+        ),
+        placeholder: (_, __) => _placeholder(context),
+        errorWidget: (_, __, ___) => _placeholder(context),
+      );
+    }
+    return _placeholder(context);
+  }
+
+  Widget _placeholder(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final initial =
+        (name?.isNotEmpty == true) ? name![0].toUpperCase() : '?';
+    return CircleAvatar(
+      radius: size / 2,
+      backgroundColor: colorScheme.primaryContainer,
+      child: Text(
+        initial,
+        style: TextStyle(
+          fontSize: size * 0.4,
+          color: colorScheme.onPrimaryContainer,
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    );
+  }
+}