refactor(ios): remove unreachable legacy bridge routes

ios/Runner/AppDelegate.swift

@@ -463,19 +463,6 @@ import UniformTypeIdentifiers
     private func invokeGoMethod(call: FlutterMethodCall) throws -> Any? {
 
         switch call.method {
-        case "downloadByStrategy":
-            let requestJson = call.arguments as! String
-            return try coreBackend.downloadByStrategy(requestJson: requestJson)
-
-
-        case "acquireDownloadDirectory":
-            let args = call.arguments as! [String: Any]
-            try coreBackend.openDownloadDirectory(path: args["path"] as! String).close()
-            return ""
-
-        case "releaseDownloadDirectory": return nil
-
-
         case "getBackendImplementations":
             return [
                 "filename": coreBackend.implementation,
@@ -484,18 +471,6 @@ import UniformTypeIdentifiers
                 "downloads": coreBackend.implementation,
             ]
 
-        case "buildFilename":
-            let args = call.arguments as! [String: Any]
-            let template = args["template"] as! String
-            let metadata = args["metadata"] as! String
-            return try coreBackend.buildFilename(template: template, metadataJson: metadata)
-
-        case "sanitizeFilename":
-            let args = call.arguments as! [String: Any]
-            let filename = args["filename"] as! String
-            return coreBackend.sanitizeFilename(filename: filename)
-
-
         case "rewriteSplitArtistTags":
             let args = call.arguments as! [String: Any]
             let filePath = args["file_path"] as! String
@@ -546,23 +521,11 @@ import UniformTypeIdentifiers
             let requestJson = args["request_json"] as? String ?? "{}"
             return try coreBackend.reEnrichFile(requestJson: requestJson)
 
-        case "readFileMetadata":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            return try coreBackend.readFileMetadata(path: filePath, hint: args["display_name"] as? String ?? "")
-
         case "checkHiResAuthenticity":
             let args = call.arguments as! [String: Any]
             let filePath = args["file_path"] as! String
             return try coreBackend.checkHiResAuthenticity(path: filePath, optionsJson: args["options_json"] as? String ?? "")
 
-        case "editFileMetadata":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let metadataJson = args["metadata_json"] as? String ?? "{}"
-            return try coreBackend.editFileMetadata(path: filePath, metadataJson: metadataJson)
-
-
         case "releaseMemory":
             try coreBackend.releaseIdleResources()
             return nil
@@ -574,13 +537,6 @@ import UniformTypeIdentifiers
 
 
 
-        case "runPostProcessingV2":
-            let args = call.arguments as! [String: Any]
-            let inputJson = args["input"] as? String ?? ""
-            let metadataJson = args["metadata"] as? String ?? ""
-            return try coreBackend.runPostProcessing(inputJson: inputJson, metadataJson: metadataJson)
-
-
         case "setLibraryCoverCacheDir":
             let args = call.arguments as! [String: Any]
             let cacheDir = args["cache_dir"] as! String