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/tmdb/tmdb.go

@@ -0,0 +1,33 @@
+package tmdb
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/rs/zerolog"
+	"go.uber.org/ratelimit"
+
+	"github.com/l3uddz/nabarr/logger"
+	"github.com/l3uddz/nabarr/util"
+)
+
+type Client struct {
+	log  zerolog.Logger
+	http *http.Client
+
+	apiKey string
+	apiURL string
+}
+
+func New(cfg *Config) *Client {
+	l := logger.Child(logger.WithLevel(cfg.Verbosity)).With().
+		Str("media", "tmdb").Logger()
+
+	return &Client{
+		log:  l,
+		http: util.NewRetryableHttpClient(30*time.Second, ratelimit.New(5, ratelimit.WithoutSlack), &l),
+
+		apiKey: cfg.ApiKey,
+		apiURL: "https://api.themoviedb.org/3",
+	}
+}