feat: add in-reader search and restructure documentation

- Add RDEPUBReaderSearchBarView with animated show/hide, keyword
  navigation, and match counting integrated into the reader controller
- Restructure docs: replace scattered design docs with consolidated
  BUSINESS_LOGIC.md and UML_CLASS_DIAGRAMS.md; update ARCHITECTURE.md
- Add SearchTests and FanrenParseTimeTest; enhance LargeBookOnDemandTests
- Add scripts/run_ui_regression.sh and summarize_ui_results.py for
  automated UI test execution and reporting

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Sources/RDReaderView/ReaderView/RDReaderView+ToolView.swift

@@ -55,6 +55,7 @@ extension RDReaderView {
             collectionView.isUserInteractionEnabled = true
             pageViewController.view.isUserInteractionEnabled = true
         }
+        onToolViewVisibilityChanged?(isShowToolView)
     }
 
     /// 判断点击命中的视图是否在指定工具栏内，用于决定是否拦截点击事件

Sources/RDReaderView/ReaderView/RDReaderView.swift

@@ -168,6 +168,10 @@ public class RDReaderView: UIView {
     public var currentDisplayType: RDReaderView.DisplayType = .pageCurl
     /// 工具栏显示/隐藏动画时长，默认 0.3 秒
     public var toolViewAnimationDuration: TimeInterval = 0.3
+    /// 工具栏可见性变化回调，参数为是否可见
+    var onToolViewVisibilityChanged: ((Bool) -> Void)?
+    /// 搜索栏视图，点击时不触发 tapCenter
+    var searchBarView: UIView?
     /// 是否启用横屏双页显示
     public var landscapeDualPageEnabled: Bool = false
     /// 翻页方向，默认从左往右（适用于中文/英文书籍）
@@ -777,6 +781,9 @@ extension RDReaderView: UIGestureRecognizerDelegate {
         if let bottomToolView, isHitView(touch.view, inside: bottomToolView, point: point) {
             return false
         }
+        if let searchBarView, isHitView(touch.view, inside: searchBarView, point: point) {
+            return false
+        }
         return true
     }