feat(batch-import): implement backend batch import service with adaptive concurrency

- Add BatchImportService with concurrent execution using asyncio.gather
- Implement AdaptiveConcurrencyController with dynamic adjustment
- Add input validation for URLs and local paths
- Support duplicate detection via skip_duplicates parameter
- Add WebSocket progress broadcasting for real-time updates
- Create comprehensive unit tests for batch import functionality
- Update API handlers and route registrations
- Add i18n translation keys for batch import UI

locales/en.json

@@ -729,6 +729,42 @@
                 "failed": "Failed to repair recipe: {message}",
                 "missingId": "Cannot repair recipe: Missing recipe ID"
             }
+        },
+        "batchImport": {
+            "title": "Batch Import Recipes",
+            "action": "Batch Import",
+            "urlsMode": "URLs / Paths",
+            "directoryMode": "Directory",
+            "urlsDescription": "Enter image URLs or local file paths (one per line). Each will be imported as a recipe.",
+            "urlsLabel": "Image URLs or Local Paths",
+            "urlsPlaceholder": "https://civitai.com/images/...\nhttps://civitai.com/images/...\nC:/path/to/image.png\n...",
+            "directoryDescription": "Enter a directory path to import all images from that folder.",
+            "directoryLabel": "Directory Path",
+            "directoryPlaceholder": "/path/to/images/folder",
+            "tagsOptional": "Tags (optional, applied to all recipes)",
+            "addTagPlaceholder": "Add a tag",
+            "addTag": "Add",
+            "noTags": "No tags added",
+            "skipNoMetadata": "Skip images without metadata",
+            "skipNoMetadataHelp": "Images without LoRA metadata will be skipped automatically.",
+            "startImport": "Start Import",
+            "importing": "Importing Recipes...",
+            "progress": "Progress",
+            "currentItem": "Current",
+            "preparing": "Preparing...",
+            "cancelImport": "Cancel",
+            "cancelled": "Batch import cancelled",
+            "completed": "Import Completed",
+            "completedSuccess": "Successfully imported {count} recipe(s)",
+            "successCount": "Successful",
+            "failedCount": "Failed",
+            "skippedCount": "Skipped",
+            "totalProcessed": "Total processed",
+            "errors": {
+                "enterUrls": "Please enter at least one URL or path",
+                "enterDirectory": "Please enter a directory path",
+                "startFailed": "Failed to start import: {message}"
+            }
         }
     },
     "checkpoints": {

locales/zh-CN.json

@@ -722,13 +722,49 @@
                 "getInfoFailed": "获取缺失 LoRA 信息失败",
                 "prepareError": "准备下载 LoRA 时出错：{message}"
             },
-            "repair": {
+"repair": {
                 "starting": "正在修复配方元数据...",
                 "success": "配方元数据修复成功",
                 "skipped": "配方已是最新版本，无需修复",
                 "failed": "修复配方失败：{message}",
                 "missingId": "无法修复配方：缺少配方 ID"
             }
+        },
+        "batchImport": {
+            "title": "批量导入配方",
+            "action": "批量导入",
+            "urlsMode": "URL / 路径",
+            "directoryMode": "目录",
+            "urlsDescription": "输入图片 URL 或本地文件路径（每行一个）。每个将作为配方导入。",
+            "urlsLabel": "图片 URL 或本地路径",
+            "urlsPlaceholder": "https://civitai.com/images/...\nhttps://civitai.com/images/...\nC:/path/to/image.png\n...",
+            "directoryDescription": "输入目录路径以导入该文件夹中的所有图片。",
+            "directoryLabel": "目录路径",
+            "directoryPlaceholder": "/图片/文件夹/路径",
+            "tagsOptional": "标签（可选，应用于所有配方）",
+            "addTagPlaceholder": "添加标签",
+            "addTag": "添加",
+            "noTags": "未添加标签",
+            "skipNoMetadata": "跳过无元数据的图片",
+            "skipNoMetadataHelp": "没有 LoRA 元数据的图片将自动跳过。",
+            "startImport": "开始导入",
+            "importing": "正在导入配方...",
+            "progress": "进度",
+            "currentItem": "当前",
+            "preparing": "准备中...",
+            "cancelImport": "取消",
+            "cancelled": "批量导入已取消",
+            "completed": "导入完成",
+            "completedSuccess": "成功导入 {count} 个配方",
+            "successCount": "成功",
+            "failedCount": "失败",
+            "skippedCount": "跳过",
+            "totalProcessed": "总计处理",
+            "errors": {
+                "enterUrls": "请至少输入一个 URL 或路径",
+                "enterDirectory": "请输入目录路径",
+                "startFailed": "启动导入失败：{message}"
+            }
         }
     },
     "checkpoints": {