feat: Add multi-threaded file transfers and enhanced logging support

- Implement concurrent file transfer processing with configurable concurrency
- Add new `max_concurrent_transfers` column to transfer configurations
- Enhance scheduler to support multi-threaded file transfers
- Introduce advanced logging system with rotation and configurable log levels
- Update Docker Compose and documentation with new logging configuration options
- Modify directory structure to separate data, backups, and logs
- Add environment variables for comprehensive logging control
- Improve error handling and logging in file transfer processes

components/config_form.templ

@@ -73,6 +73,7 @@ func getInitialData(config *db.TransferConfig) string {
 	archiveEnabled := false
 	deleteAfterTransfer := false
 	skipProcessedFiles := true
+	maxConcurrentTransfers := 4
 	rcloneFlags := ""
 
 	// If editing an existing config, populate with those values
@@ -131,6 +132,7 @@ func getInitialData(config *db.TransferConfig) string {
 		archiveEnabled = config.ArchiveEnabled
 		deleteAfterTransfer = config.DeleteAfterTransfer
 		skipProcessedFiles = config.SkipProcessedFiles
+		maxConcurrentTransfers = config.MaxConcurrentTransfers
 		rcloneFlags = config.RcloneFlags
 	}
 
@@ -186,6 +188,7 @@ func getInitialData(config *db.TransferConfig) string {
 		archiveEnabled: %v,
 		deleteAfterTransfer: %v,
 		skipProcessedFiles: %v,
+		maxConcurrentTransfers: %d,
 		rcloneFlags: '%s',
 	}`, 
 	name, sourceType, sourcePath, sourceHost, sourcePort, sourceUser, sourcePassword, sourceKeyFile, sourceAuthType,
@@ -195,7 +198,7 @@ func getInitialData(config *db.TransferConfig) string {
 	destinationType, destinationPath, destHost, destPort, destUser, destPassword, destKeyFile, destAuthType,
 	destBucket, destRegion, destAccessKey, destSecretKey, destEndpoint, destShare, destDomain, destPassiveMode,
 	destClientId, destClientSecret, destDriveId, destTeamDrive,
-	archivePath, archiveEnabled, deleteAfterTransfer, skipProcessedFiles, rcloneFlags)
+	archivePath, archiveEnabled, deleteAfterTransfer, skipProcessedFiles, maxConcurrentTransfers, rcloneFlags)
 }
 
 templ ConfigForm(ctx context.Context, data ConfigFormData) {

components/providers/common/common.templ

@@ -141,6 +141,21 @@ templ ArchiveOptions() {
 				Files with the same hash that have been successfully processed before will be skipped
 			</p>
 		</div>
+
+		<div class="mb-4">
+			<label for="max_concurrent_transfers" class="block text-sm font-medium text-gray-700 mb-1">Concurrent Transfers</label>
+			<div class="flex items-center">
+				<input type="range" id="max_concurrent_transfers" name="max_concurrent_transfers" 
+					class="form-range w-2/3 h-2 bg-gray-200 rounded-lg appearance-none cursor-pointer"
+					min="1" max="20" step="1"
+					x-model="maxConcurrentTransfers" 
+				/>
+				<span class="ml-4 text-gray-700" x-text="maxConcurrentTransfers"></span>
+			</div>
+			<p class="mt-1 text-xs text-gray-500">
+				Number of files to transfer simultaneously (higher values may improve performance but increase resource usage)
+			</p>
+		</div>
 	</div>
 }