Refactor Jellyfin plugin: UI integration, backend contract, and STRM creation.

- Integrated "Recommend Film", "Add Movie (STRM)", and Rating UI into Jellyfin web interface.
- Implemented full library sync (metadata with poster URLs, user states) with library filtering support.
- Added support for creating films via .strm file generation.
- Updated MovieNightBackendClient to support sync, recommendations, ratings, and viewed status.
- Added proxy endpoints to MovieNightController for frontend-backend communication.
- Ensured compatibility with Jellyfin 10.11.x and .NET 9.0.

Co-authored-by: devitq <118541411+devitq@users.noreply.github.com>

plugins/jellyfin/Jellyfin.Plugin.MovieNight/Configuration/configPage.html

@@ -27,6 +27,12 @@
                         <input is="emby-input" id="SyncIntervalMinutes" name="SyncIntervalMinutes" type="number" min="1" max="1440" />
                     </div>
 
+                    <div class="inputContainer">
+                        <label class="inputLabel inputLabelUnfocused" for="StrmOutputPath">STRM output path</label>
+                        <input is="emby-input" id="StrmOutputPath" name="StrmOutputPath" type="text" placeholder="/data/movies/movienight" />
+                        <div class="fieldDescription">Directory where .strm files will be created for new films.</div>
+                    </div>
+
                     <label class="checkboxContainer">
                         <input id="Enabled" name="Enabled" type="checkbox" is="emby-checkbox" />
                         <span>Enable MovieNight integration</span>