添加图片库、封装

keyBoard/Class/Categories/KBWebImageManager.h

@@ -0,0 +1,31 @@
+//
+//  KBWebImageManager.h
+//  keyBoard
+//
+//  SDWebImage 的二次封装：全局配置、预取、缓存管理
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface KBWebImageManager : NSObject
+
+/// 预取一组图片
++ (void)prefetchURLs:(NSArray<id> *)urlList
+            progress:(void(^_Nullable)(NSUInteger finished, NSUInteger total))progress
+           completed:(void(^_Nullable)(NSUInteger finished, NSUInteger skipped))completed;
+
+/// 异步计算磁盘缓存大小（字节）
++ (void)calculateDiskSize:(void(^)(NSUInteger bytes))completion;
+
+/// 清理内存+磁盘缓存
++ (void)clearAllCache:(void(^_Nullable)(void))completion;
+
+/// 设置全局 HTTP Header（如鉴权 Token）
++ (void)setHTTPHeaderValue:(nullable NSString *)value forKey:(NSString *)field;
+
+@end
+
+NS_ASSUME_NONNULL_END
+