Fix idempotent FTPS directory setup (#217)

The production FTPS deploy now authenticates, but lftp exits when cPanel
returns 550 File exists for pre-created deployment directories. Use lftp
mkdir -p -f for the archive and activation directories so retries remain
idempotent while subsequent upload operations still surface real access
failures.\n\nVerification:\n- vitest tests/unit/cpanel-deploy.spec.js
(26 passed)\n- eslint scripts/release/cpanel-deploy-lib.mjs
tests/unit/cpanel-deploy.spec.js\n- git diff --check

Co-authored-by: Jeppe Bundgaard <jb@truckwash.dk>

scripts/release/cpanel-deploy-lib.mjs

@@ -247,6 +247,10 @@ function lftpQuote(value) {
   return `'${String(value).replaceAll("'", `'\\''`)}'`;
 }
 
+function ensureLftpDirectory(value) {
+  return `mkdir -p -f ${lftpQuote(value)}`;
+}
+
 export function buildLftpScript(config, commands) {
   const { host, user, password, root } = config.ftp;
   const lines = [
@@ -498,8 +502,8 @@ export function createLftpTransport(config, dependencies = {}) {
       let queueError;
       try {
         await run([
-          `mkdir -p ${lftpQuote("activation-requests")}`,
-          `mkdir -p ${lftpQuote("activation-results")}`,
+          ensureLftpDirectory("activation-requests"),
+          ensureLftpDirectory("activation-results"),
           `rm -f ${lftpQuote(`${remoteRequest}.part`)}`,
           `put ${lftpQuote(requestPath)} -o ${lftpQuote(`${remoteRequest}.part`)}`,
           `mv ${lftpQuote(`${remoteRequest}.part`)} ${lftpQuote(remoteRequest)}`,
@@ -557,7 +561,7 @@ export function createLftpTransport(config, dependencies = {}) {
       const downloadedChecksum = path.join(temporaryDirectory, checksumName);
       try {
         await run([
-          `mkdir -p ${lftpQuote("archives")}`,
+          ensureLftpDirectory("archives"),
           `rm -f ${lftpQuote(`archives/${archiveName}.part`)}`,
           `rm -f ${lftpQuote(`archives/${checksumName}.part`)}`,
           `put ${lftpQuote(config.archivePath)} -o ${lftpQuote(`archives/${archiveName}.part`)}`,