Add IMDb movie importer feature and unify header

Introduces a new movie importer feature allowing admins to search and import movies from IMDb, including new components for search, result display, and error handling. Replaces the schedule header with a reusable menu header component. Updates routing, navigation, and HTTP service to support the new importer. Adds a poster placeholder image and improves poster error handling.

src/app/http.service.ts

@@ -1,4 +1,4 @@
-import { Kinosaal, Sitzplatz, Vorstellung, Film } from '@infinimotion/model-frontend';
+import { Kinosaal, Sitzplatz, Vorstellung, Film, OmdbSearch } from '@infinimotion/model-frontend';
 import { HttpClient } from "@angular/common/http";
 import { inject, Injectable } from "@angular/core";
 import { Observable } from "rxjs";
@@ -52,7 +52,7 @@ export class HttpService {
   }
 
   /* POST /api/vorstellung/filter */
-  getPerformaceByFilter(filter: string[]): Observable<Vorstellung[]> {
+  getPerformacesByFilter(filter: string[]): Observable<Vorstellung[]> {
     return this.http.post<Vorstellung[]>(`${this.baseUrl}vorstellung/filter`, filter);
   }
 
@@ -79,11 +79,31 @@ export class HttpService {
     return this.http.get<Film[]>(`${this.baseUrl}film`);
   }
 
+  /* POST /api/vorstellung/filter */
+  getMoviesByFilter(filter: string[]): Observable<Film[]> {
+    return this.http.post<Film[]>(`${this.baseUrl}film/filter`, filter);
+  }
 
-  /* Show-Seats APIs*/
+
+  /* Show-Seats APIs */
 
   /* GET /api/show-seats/{show} */
   getSeatsByShowId(show: number): Observable<{seats:Sitzplatz[], reserved:Sitzplatz[], booked:Sitzplatz[]}> {
     return this.http.get<{seats:Sitzplatz[], reserved:Sitzplatz[], booked:Sitzplatz[]}>(`${this.baseUrl}show-seats/${show}`);
   }
+
+
+  /* Movie Importer APIs */
+
+  /* GET /api/importer/search */
+  searchMovie(query: string): Observable<OmdbSearch> {
+    return this.http.get<OmdbSearch>(`${this.baseUrl}importer/search`, {
+      params: { title: query }
+    });
+  }
+
+  /* POST /api/importer/import */
+  importMovie(imdbId: string): Observable<Film> {
+      return this.http.post<Film>(`${this.baseUrl}importer/import?id=${imdbId}`, {})
+  }
 }