feat: enrich RSS items without IDs via TMDB title search

Items from RSS feeds that have no media ID (tmdb/imdb/tvdb) are now
enriched automatically using TMDB's search API. The release name is
parsed to extract a clean title and year, then searched against TMDB
to retrieve the TMDB ID before validation.

- Add media/tmdb package with SearchMovies, SearchShows, and
  ExtractTitleAndYear (parses torrent release names)
- Add EnrichFeedItemWithTmdbId to media.Client, called in rss/process.go
  before the ID validation switch
- Add --run-now flag to nabarr run to trigger all feeds immediately
- Wire media.Client through rss.Client and rssJob
- Merge feature/add-tag-option (tag support for Sonarr/Radarr)

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

rss/process.go

@@ -128,6 +128,11 @@ func (j *rssJob) getFeed() ([]media.FeedItem, error) {
 			}
 		}
 
+		// attempt to enrich items missing IDs via Trakt title search
+		if j.mediaClient != nil {
+			j.mediaClient.EnrichFeedItemWithTmdbId(&b.Channel.Items[p])
+		}
+
 		// validate item
 		switch {
 		case b.Channel.Items[p].TvdbId != "" && !util.StringSliceContains([]string{"0", "1"}, b.Channel.Items[p].TvdbId):