feat(settings): 站点界面动画总开关与子开关

管理后台可关全站动画，并细调代码折叠、平滑滚动、装饰入场；统一 lib/motion，尊重系统减少动态效果。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/service/setting.go

@@ -25,6 +25,14 @@ const (
 	SettingKeyCodeBlockAutoFold = "code_block_auto_fold"
 	// SettingKeyCodeBlockFoldLines 超过该行数则折叠；0=无预览；缺行=5
 	SettingKeyCodeBlockFoldLines = "code_block_fold_lines"
+	// SettingKeyUIAnimations 界面动画总开关；缺行视为开启
+	SettingKeyUIAnimations = "ui_animations"
+	// SettingKeyAnimCodeFold 代码折叠高度/跟滚动画；缺行视为开启
+	SettingKeyAnimCodeFold = "anim_code_fold"
+	// SettingKeyAnimSmoothScroll 平滑滚动；缺行视为开启
+	SettingKeyAnimSmoothScroll = "anim_smooth_scroll"
+	// SettingKeyAnimChrome 装饰入场（列表/Toast/点赞等）；缺行视为开启
+	SettingKeyAnimChrome = "anim_chrome"
 )
 
 const (
@@ -57,6 +65,10 @@ type PublicSiteSettings struct {
 	PostCooldownHours     int    `json:"post_cooldown_hours"`
 	CodeBlockAutoFold     bool   `json:"code_block_auto_fold"`
 	CodeBlockFoldLines    int    `json:"code_block_fold_lines"`
+	UIAnimations          bool   `json:"ui_animations"`
+	AnimCodeFold          bool   `json:"anim_code_fold"`
+	AnimSmoothScroll      bool   `json:"anim_smooth_scroll"`
+	AnimChrome            bool   `json:"anim_chrome"`
 }
 
 // SettingService 站点级键值设置
@@ -119,6 +131,10 @@ func (s *SettingService) Public() (PublicSiteSettings, error) {
 		PostCooldownHours:    DefaultCooldownHours,
 		CodeBlockAutoFold:    true,
 		CodeBlockFoldLines:   DefaultCodeFoldLines,
+		UIAnimations:         true,
+		AnimCodeFold:         true,
+		AnimSmoothScroll:     true,
+		AnimChrome:           true,
 	}
 	accent, err := s.AccentColor()
 	if err != nil {
@@ -174,6 +190,30 @@ func (s *SettingService) Public() (PublicSiteSettings, error) {
 		return out, err
 	}
 	out.CodeBlockFoldLines = foldLines
+
+	uiAnim, err := s.UIAnimations()
+	if err != nil {
+		return out, err
+	}
+	out.UIAnimations = uiAnim
+
+	animFold, err := s.AnimCodeFold()
+	if err != nil {
+		return out, err
+	}
+	out.AnimCodeFold = animFold
+
+	animScroll, err := s.AnimSmoothScroll()
+	if err != nil {
+		return out, err
+	}
+	out.AnimSmoothScroll = animScroll
+
+	animChrome, err := s.AnimChrome()
+	if err != nil {
+		return out, err
+	}
+	out.AnimChrome = animChrome
 	return out, nil
 }
 
@@ -318,3 +358,55 @@ func (s *SettingService) SetCodeBlockFoldLines(lines int) error {
 	}
 	return s.putValue(SettingKeyCodeBlockFoldLines, strconv.Itoa(lines))
 }
+
+// UIAnimations 界面动画总开关。缺行视为开启；关闭后全站减少动态效果。
+func (s *SettingService) UIAnimations() (bool, error) {
+	v, found, err := s.getValue(SettingKeyUIAnimations)
+	if err != nil {
+		return true, err
+	}
+	return parseBoolDefaultTrue(v, found), nil
+}
+
+func (s *SettingService) SetUIAnimations(on bool) error {
+	return s.setBoolDefaultTrue(SettingKeyUIAnimations, on)
+}
+
+// AnimCodeFold 代码折叠动画子开关（总开关开启时生效）。
+func (s *SettingService) AnimCodeFold() (bool, error) {
+	v, found, err := s.getValue(SettingKeyAnimCodeFold)
+	if err != nil {
+		return true, err
+	}
+	return parseBoolDefaultTrue(v, found), nil
+}
+
+func (s *SettingService) SetAnimCodeFold(on bool) error {
+	return s.setBoolDefaultTrue(SettingKeyAnimCodeFold, on)
+}
+
+// AnimSmoothScroll 平滑滚动子开关（总开关开启时生效）。
+func (s *SettingService) AnimSmoothScroll() (bool, error) {
+	v, found, err := s.getValue(SettingKeyAnimSmoothScroll)
+	if err != nil {
+		return true, err
+	}
+	return parseBoolDefaultTrue(v, found), nil
+}
+
+func (s *SettingService) SetAnimSmoothScroll(on bool) error {
+	return s.setBoolDefaultTrue(SettingKeyAnimSmoothScroll, on)
+}
+
+// AnimChrome 装饰入场子开关（列表/Toast/点赞等；总开关开启时生效）。
+func (s *SettingService) AnimChrome() (bool, error) {
+	v, found, err := s.getValue(SettingKeyAnimChrome)
+	if err != nil {
+		return true, err
+	}
+	return parseBoolDefaultTrue(v, found), nil
+}
+
+func (s *SettingService) SetAnimChrome(on bool) error {
+	return s.setBoolDefaultTrue(SettingKeyAnimChrome, on)
+}