feat: 添加自定义返回链接前缀功能，优化默认格式下的链接拼接

src/settings/settingsTab.ts

@@ -233,8 +233,23 @@ export class CFImageBedSettingTab extends PluginSettingTab {
 				.onChange(async (value: string) => {
 					this.plugin.settings.returnFormat = value;
 					await this.plugin.saveSettings();
+					this.display();
 				}));
 
+		// 自定义返回链接前缀（仅默认格式时显示）
+		if (this.plugin.settings.returnFormat !== 'full') {
+			new Setting(container)
+				.setName(this.i18n.t('settings.basic.customReturnBaseUrl.name'))
+				.setDesc(this.i18n.t('settings.basic.customReturnBaseUrl.desc'))
+				.addText((text: TextComponent) => text
+					.setPlaceholder(this.i18n.t('settings.basic.customReturnBaseUrl.placeholder'))
+					.setValue(this.plugin.settings.customReturnBaseUrl || '')
+					.onChange(async (value: string) => {
+						this.plugin.settings.customReturnBaseUrl = value.trim();
+						await this.plugin.saveSettings();
+					}));
+		}
+
 		// 上传目录设置
 		new Setting(container)
 			.setName(this.i18n.t('settings.basic.uploadFolder.name'))

src/types/index.ts

@@ -41,6 +41,9 @@ export interface CFImageBedSettings {
 	enableLocalBackup: boolean;
 	backupPath: string;
 	
+	// 返回链接自定义前缀
+	customReturnBaseUrl: string;
+
 	// 语言配置
 	language: 'zh' | 'en';
 }
@@ -86,6 +89,9 @@ export const DEFAULT_SETTINGS: CFImageBedSettings = {
 	enableLocalBackup: false,
 	backupPath: 'attachments/backup',
 	
+	// 返回链接自定义前缀
+	customReturnBaseUrl: '',
+
 	// 语言配置
 	language: 'zh',
 

src/upload/uploadService.ts

@@ -125,9 +125,9 @@ export class UploadService {
 					// 完整链接格式，直接返回
 					return src;
 				} else {
-					// 默认格式，需要拼接API URL
-					const fullUrl = `${this.settings.apiUrl}${src}`;
-					return fullUrl;
+					// 默认格式，需要拼接基础 URL（优先使用自定义前缀，否则回退到 API URL）
+					const baseUrl = this.settings.customReturnBaseUrl?.trim() || this.settings.apiUrl;
+					return `${baseUrl}${src}`;
 				}
 			} else {
 				throw new Error(this.i18n.t('errors.serverResponseInvalid'));

src/utils/i18n.ts

@@ -78,6 +78,11 @@ const translations: Record<Language, Translations> = {
 						full: '完整链接格式'
 					}
 				},
+				customReturnBaseUrl: {
+					name: '自定义返回链接前缀',
+					desc: '默认格式下拼接返回链接时使用的基础 URL，为空时使用 API URL',
+					placeholder: 'https://cdn.example.com'
+				},
 				uploadFolder: {
 					name: '上传目录',
 					desc: '上传目录，使用相对路径',
@@ -323,6 +328,11 @@ const translations: Record<Language, Translations> = {
 						full: 'Full link format'
 					}
 				},
+				customReturnBaseUrl: {
+					name: 'Custom return URL prefix',
+					desc: 'Base URL used when concatenating the return link in default format. Falls back to API URL when empty.',
+					placeholder: 'https://cdn.example.com'
+				},
 				uploadFolder: {
 					name: 'Upload folder',
 					desc: 'Upload folder using a relative path',