Add Mega-Debrid account info check (web scraping)

Scrapes the Mega-Debrid profile page to display username, premium status,
remaining days, and loyalty points. New "Account prüfen" button in Settings > Accounts.

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

src/shared/ipc.ts

@@ -36,5 +36,6 @@ export const IPC_CHANNELS = {
   EXTRACT_NOW: "queue:extract-now",
   GET_HISTORY: "history:get",
   CLEAR_HISTORY: "history:clear",
-  REMOVE_HISTORY_ENTRY: "history:remove-entry"
+  REMOVE_HISTORY_ENTRY: "history:remove-entry",
+  CHECK_ACCOUNT: "app:check-account"
 } as const;

src/shared/preload-api.ts

@@ -3,6 +3,7 @@ import type {
   AppSettings,
   DuplicatePolicy,
   HistoryEntry,
+  ProviderAccountInfo,
   SessionStats,
   StartConflictEntry,
   StartConflictResolutionResult,
@@ -48,6 +49,7 @@ export interface ElectronApi {
   getHistory: () => Promise<HistoryEntry[]>;
   clearHistory: () => Promise<void>;
   removeHistoryEntry: (entryId: string) => Promise<void>;
+  checkAccount: (provider: string) => Promise<ProviderAccountInfo>;
   onStateUpdate: (callback: (snapshot: UiSnapshot) => void) => () => void;
   onClipboardDetected: (callback: (links: string[]) => void) => () => void;
   onUpdateInstallProgress: (callback: (progress: UpdateInstallProgress) => void) => () => void;

src/shared/types.ts

@@ -269,6 +269,15 @@ export interface HistoryEntry {
   outputDir: string;
 }
 
+export interface ProviderAccountInfo {
+  provider: DebridProvider;
+  username: string;
+  accountType: string;
+  daysRemaining: number | null;
+  loyaltyPoints: number | null;
+  error?: string;
+}
+
 export interface HistoryState {
   entries: HistoryEntry[];
   maxEntries: number;