fix: 完成 B-1, B-2, B-4（proxy 硬编码移除 + re-scan 端点）

B-1: 移除 proxy 硬编码路径
- 移除 API_KEY 常量，改为 get_api_key() 从环境变量读取
- 移除 PROFILE_DIRS，改为 get_output_dir() 从环境变量读取
- 移除 output_bases (identity_matches, trace_profile)，改为环境变量驱动
- 移除 ADMIN_CONFIG_PATH，改为 get_admin_config_path() 从环境变量读取
- 添加 dev fallback 支持开发环境

B-2: API key 改为环境变量
- MOMENTRY_API_KEY 环境变量必须设置
- 未设置时会明确报错启动

B-4: 改用 re-scan 端点
- 简化 doReprocess 函数从 92 行减少到 32 行
- 改用单一 POST /api/v1/re-scan API
- 显式传 auto_pipeline: true
- 移除 unregister → register → process 手动串接
- 原子性操作，避免中间失败留下不一致状态

环境变量：
- MOMENTRY_API_KEY (必需)
- MOMENTRY_OUTPUT_DIR (可选，默认 /Users/accusys/momentry/output)
- MOMENTRY_DATA_DIR (可选，默认 /Users/accusys/momentry/data)
- MOMENTRY_ADMIN_CONFIG (可选，默认 /Users/accusys/momentry/config/admin_config.json)

src/api/index.ts

@@ -536,6 +536,9 @@ case 'search_keyword': {
     case 'process_file': {
       return { url: `/api/v1/file/${a.fileUuid}/process`, method: 'POST', body: { processors: a.processors } }
     }
+    case 're_scan_file': {
+      return { url: `/api/v1/re-scan`, method: 'POST', body: { file_uuid: a.fileUuid, auto_pipeline: a.autoPipeline ?? true } }
+    }
     case 'get_identity_matches': {
       return { url: `/api/v1/identity-matches?file_hash=${a.fileHash}`, method: 'GET' }
     }

src/views/LibraryView.vue

@@ -1962,93 +1962,34 @@ async function doReprocess(f: any) {
   if (reprocessing.value) return
   if (!f.isRegistered) { actionMsg.value = 'File not registered'; return }
   reprocessing.value = true
-  const oldUuid = f.file_uuid
-  actionMsg.value = '🔄 Unregistering...'
+  
   try {
-    const unregResult: any = await apiCall('unregister_file', { fileUuid: oldUuid, deleteOutputFiles: true })
-    if (!unregResult.success) {
-      actionMsg.value = `Unregister failed: ${unregResult.message}`
-      reprocessing.value = false
-      setTimeout(() => { actionMsg.value = '' }, 8000)
-      return
-    }
+    actionMsg.value = '🔄 Re-scanning...'
     
-    if (unregResult.command_id) {
-      actionMsg.value = '🔄 Waiting for unregister...'
-      await pollCommandStatus(unregResult.command_id)
-    }
-
-    // Clear all cached state for this file
-    delete fileProgressCache.value[oldUuid]
-    delete processorCountsCache.value[oldUuid]
-
-    actionMsg.value = '⏳ Waiting for unregister to stabilize...'
-    await waitForStable(async () => {
-      await invalidateFiles()
-      await ensureFiles()
-      return !filesCache.value.some((x: any) => x.file_uuid === oldUuid && x.isRegistered)
+    // Use single re-scan API with auto_pipeline: true
+    const result = await apiCall('re_scan_file', { 
+      fileUuid: f.file_uuid,
+      autoPipeline: true
     })
-
-    actionMsg.value = '📥 Registering...'
-    const filePath = f.file_path || f.relative_path || f.file_name
-    if (!filePath) { actionMsg.value = 'Missing file path'; reprocessing.value = false; return }
-    const regResult: any = await apiCall('register_file', { filePath })
-    if (!regResult.success) {
-      actionMsg.value = `Register failed: ${regResult.message}`
-      reprocessing.value = false
-      setTimeout(() => { actionMsg.value = '' }, 8000)
-      return
-    }
     
-    let newUuid = regResult.file_uuid
-    if (regResult.command_id && !newUuid) {
-      actionMsg.value = '📥 Waiting for registration...'
-      const finalStatus = await pollCommandStatus(regResult.command_id)
-      newUuid = finalStatus.file_uuid
-    }
-    
-    if (!newUuid) {
-      actionMsg.value = `Registration completed but no file_uuid`
-      reprocessing.value = false
-      return
-    }
-    
-    f.file_uuid = newUuid
-    f.isRegistered = true
-
-    actionMsg.value = '⏳ Waiting for registration to stabilize...'
-    await waitForStable(async () => {
-      await invalidateFiles()
-      await ensureFiles()
-      const found = filesCache.value.find((x: any) => x.file_uuid === f.file_uuid)
-      return found && found.isRegistered && found.status === 'registered'
-    })
-
-    actionMsg.value = '🔍 Scanning...'
-    const procs = selectedProcessors()
-    if (!procs.length) { actionMsg.value = 'Please select at least one processor'; reprocessing.value = false; return }
-    
-    // Immediately update status to show user the action started
-    f.status = 'scanning'
-    fileStatusCache.value[f.file_uuid] = 'scanning'
-    
-    const procResult: any = await apiCall('process_file', { fileUuid: f.file_uuid, processors: procs })
-    if (procResult.success) {
-      actionMsg.value = `Re-scan started: ${f.file_name}`
-      syncFileStatus(f.file_uuid)
+    if (result.success) {
+      actionMsg.value = '✅ Re-scan started'
+      // Update status to scanning
+      f.status = 'scanning'
+      fileStatusCache.value[f.file_uuid] = 'scanning'
+      // Sync status from Core API
+      await syncFileStatus(f.file_uuid)
     } else {
-      actionMsg.value = `Scan failed: ${procResult.message}`
-      // Revert status on failure
-      f.status = 'registered'
-      fileStatusCache.value[f.file_uuid] = 'registered'
+      actionMsg.value = `Failed: ${result.message || result.error}`
     }
   } catch (e: any) {
-    actionMsg.value = `Reprocess error: ${e}`
-    console.error('[reprocess]', e)
+    actionMsg.value = `Error: ${e.message}`
+    console.error('[re-scan]', e)
+  } finally {
+    reprocessing.value = false
+    await loadFiles()
+    setTimeout(() => { actionMsg.value = '' }, 5000)
   }
-  reprocessing.value = false
-  await loadFiles()
-  setTimeout(() => { actionMsg.value = '' }, 8000)
 }
 
 async function ctxUnregister(f: any) {