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>

media/config.go

@@ -2,6 +2,7 @@ package media
 
 import (
 	"github.com/l3uddz/nabarr/media/omdb"
+	"github.com/l3uddz/nabarr/media/tmdb"
 	"github.com/l3uddz/nabarr/media/trakt"
 	"github.com/l3uddz/nabarr/media/tvdb"
 )
@@ -10,6 +11,7 @@ type Config struct {
 	Trakt trakt.Config `yaml:"trakt"`
 	Omdb  omdb.Config  `yaml:"omdb"`
 	Tvdb  tvdb.Config  `yaml:"tvdb"`
+	Tmdb  tmdb.Config  `yaml:"tmdb"`
 
 	Verbosity string `yaml:"verbosity,omitempty"`
 }