Add DDownload provider, post-processing status labels, and update changelog

- DDownload (ddownload.com/ddl.to) as new hoster with web login
- Post-processing labels: Entpacken/Renaming/Aufräumen/MKVs
- Release notes shown in update confirmation dialog

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/storage.ts

@@ -5,8 +5,8 @@ import { AppSettings, BandwidthScheduleEntry, DebridProvider, DownloadItem, Down
 import { defaultSettings } from "./constants";
 import { logger } from "./logger";
 
-const VALID_PRIMARY_PROVIDERS = new Set(["realdebrid", "megadebrid", "bestdebrid", "alldebrid"]);
-const VALID_FALLBACK_PROVIDERS = new Set(["none", "realdebrid", "megadebrid", "bestdebrid", "alldebrid"]);
+const VALID_PRIMARY_PROVIDERS = new Set(["realdebrid", "megadebrid", "bestdebrid", "alldebrid", "ddownload"]);
+const VALID_FALLBACK_PROVIDERS = new Set(["none", "realdebrid", "megadebrid", "bestdebrid", "alldebrid", "ddownload"]);
 const VALID_CLEANUP_MODES = new Set(["none", "trash", "delete"]);
 const VALID_CONFLICT_MODES = new Set(["overwrite", "skip", "rename", "ask"]);
 const VALID_FINISHED_POLICIES = new Set(["never", "immediate", "on_start", "package_done"]);
@@ -17,7 +17,7 @@ const VALID_PACKAGE_PRIORITIES = new Set<string>(["high", "normal", "low"]);
 const VALID_DOWNLOAD_STATUSES = new Set<DownloadStatus>([
   "queued", "validating", "downloading", "paused", "reconnect_wait", "extracting", "integrity_check", "completed", "failed", "cancelled"
 ]);
-const VALID_ITEM_PROVIDERS = new Set<DebridProvider>(["realdebrid", "megadebrid", "bestdebrid", "alldebrid"]);
+const VALID_ITEM_PROVIDERS = new Set<DebridProvider>(["realdebrid", "megadebrid", "bestdebrid", "alldebrid", "ddownload"]);
 const VALID_ONLINE_STATUSES = new Set(["online", "offline", "checking"]);
 
 function asText(value: unknown): string {
@@ -111,6 +111,8 @@ export function normalizeSettings(settings: AppSettings): AppSettings {
     megaPassword: asText(settings.megaPassword),
     bestToken: asText(settings.bestToken),
     allDebridToken: asText(settings.allDebridToken),
+    ddownloadLogin: asText(settings.ddownloadLogin),
+    ddownloadPassword: asText(settings.ddownloadPassword),
     archivePasswordList: String(settings.archivePasswordList ?? "").replace(/\r\n/g, "\n"),
     rememberToken: Boolean(settings.rememberToken),
     providerPrimary: settings.providerPrimary,
@@ -200,7 +202,9 @@ function sanitizeCredentialPersistence(settings: AppSettings): AppSettings {
     megaLogin: "",
     megaPassword: "",
     bestToken: "",
-    allDebridToken: ""
+    allDebridToken: "",
+    ddownloadLogin: "",
+    ddownloadPassword: ""
   };
 }
 
@@ -442,6 +446,7 @@ export function normalizeLoadedSessionTransientFields(session: SessionState): Se
     if (ACTIVE_PKG_STATUSES.has(pkg.status)) {
       pkg.status = "queued";
     }
+    pkg.postProcessLabel = undefined;
   }
 
   // Clear stale session-level running/paused flags