feat(stalker): feat: add auth for stalker portal, expend portal import UI

Refactor stalker-series-view template to guard fields with conditionals
so that only available metadata is displayed. Replace selectedItem() with
displayItem() to use the updated selection accessor. Add checks for
director, actors, year/release date, genre/genres_str, imdb and kinopoisk
ratings to avoid showing empty labels.

Enhance stalker-portal-import component by adding reactive form fields
for serial/device IDs and signatures, importing MatProgressSpinnerModule,
and wiring TranslateService and StalkerSessionService into the component.
Include a small loading-container style. These changes prepare the UI for
improved import UX and safer rendering of optional series metadata.

libs/shared/interfaces/src/lib/playlist-meta.type.ts

@@ -21,4 +21,9 @@ export type PlaylistMeta = Pick<
     | 'macAddress'
     | 'portalUrl'
     | 'recentlyViewed'
+    | 'stalkerSerialNumber'
+    | 'stalkerDeviceId1'
+    | 'stalkerDeviceId2'
+    | 'stalkerSignature1'
+    | 'stalkerSignature2'
 >;

libs/shared/interfaces/src/lib/playlist.interface.ts

@@ -37,4 +37,25 @@ export interface Playlist {
     macAddress?: string;
     portalUrl?: string;
     recentlyViewed?: any[];
+    /** Indicates if this is a full stalker portal URL (e.g., /stalker_portal/c) requiring handshake authentication */
+    isFullStalkerPortal?: boolean;
+    /** Session token for full stalker portal authentication - persisted for session */
+    stalkerToken?: string;
+    /** Serial number for stalker portal - generated once and stored for consistency */
+    stalkerSerialNumber?: string;
+    /** Optional device ID 1 for stalker portal - if not provided, auto-generated from MAC */
+    stalkerDeviceId1?: string;
+    /** Optional device ID 2 for stalker portal - if not provided, auto-generated from MAC */
+    stalkerDeviceId2?: string;
+    /** Optional signature 1 for stalker portal - required by some portals for device verification */
+    stalkerSignature1?: string;
+    /** Optional signature 2 for stalker portal - required by some portals for device verification */
+    stalkerSignature2?: string;
+    /** Account info from get_profile call */
+    stalkerAccountInfo?: {
+        login?: string;
+        expireDate?: number;
+        tariffPlanName?: string;
+        status?: number;
+    };
 }