chore: 优化本地开发环境配置

- 添加 .env.local 支持，app.sh 和 dev-migrate.sh 自动覆盖
- Docker Compose 使用 profiles 区分 dev/prod 环境
- 改进认证 dev session 判断逻辑，使用 test account 配置
- 修复 CoinPackageCard 重复代码问题
- 清理 opencode 配置，移除敏感信息
- 新增 infra/docker/README.md 文档
- 修复 ruff/pyright/flutter lint 错误
- 更新测试用例移除已删除的 country 字段

backend/tests/unit/test_parse_profile_settings.py

@@ -17,7 +17,6 @@ class TestParseProfileSettings:
             "preferences": {
                 "language": "en-US",
                 "timezone": "America/New_York",
-                "country": "US",
             },
             "privacy": {"profile_visibility": "private"},
             "notification": {
@@ -32,7 +31,6 @@ class TestParseProfileSettings:
         assert isinstance(result.preferences, PreferenceSettings)
         assert result.preferences.language == "en-US"
         assert result.preferences.timezone == "America/New_York"
-        assert result.preferences.country == "US"
         assert isinstance(result.notification, NotificationSettings)
         assert result.notification.allow_notifications is True
         assert result.notification.allow_vibration is False
@@ -45,7 +43,6 @@ class TestParseProfileSettings:
         assert isinstance(result.preferences, PreferenceSettings)
         assert result.preferences.language == "zh-CN"
         assert result.preferences.timezone == "Asia/Shanghai"
-        assert result.preferences.country == "US"
         assert isinstance(result.notification, NotificationSettings)
         assert result.notification.allow_notifications is True
         assert result.notification.allow_vibration is True
@@ -60,7 +57,6 @@ class TestParseProfileSettings:
 
         assert result.preferences.language == "en-US"
         assert result.preferences.timezone == "Asia/Shanghai"
-        assert result.preferences.country == "US"
 
     def test_parse_profile_settings_with_partial_notification(self) -> None:
         raw = {
@@ -104,21 +100,11 @@ class TestParseProfileSettings:
         with pytest.raises(ValueError, match="timezone must be a valid IANA timezone"):
             parse_profile_settings(raw)
 
-    def test_parse_profile_settings_country_normalized_to_uppercase(self) -> None:
-        raw = {
-            "preferences": {
-                "country": "us",
-            },
-        }
-        result = parse_profile_settings(raw)
-        assert result.preferences.country == "US"
-
     def test_profile_settings_v1_model_dump(self) -> None:
         settings = ProfileSettingsV1(
             preferences=PreferenceSettings(
                 language="en-US",
                 timezone="UTC",
-                country="US",
             ),
             notification=NotificationSettings(
                 allow_notifications=True,