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/struct.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/l3uddz/nabarr/cache"
 	"github.com/l3uddz/nabarr/cmd/nabarr/pvr"
+	"github.com/l3uddz/nabarr/media"
 )
 
 type feedItem struct {
@@ -26,9 +27,10 @@ type Config struct {
 }
 
 type rssJob struct {
-	name string
-	log  zerolog.Logger
-	http *http.Client
+	name        string
+	log         zerolog.Logger
+	http        *http.Client
+	mediaClient *media.Client
 
 	url  string
 	pvrs map[string]pvr.PVR