Add support for notification dry run feature

- Introduced NOTIFICATION_DRY_RUN configuration option in .env.example and k8s/secret.example.yaml.
- Updated README.md to include usage instructions for the new dry run feature.
- Implemented logic in app.go to preview notifications without sending them when the dry run option is enabled.
- Enhanced config.go to load the new configuration option and validate notification types accordingly.
- Added a new function in notify.go to generate manual-needed notification messages for preview.

internal/qbit/client_test.go

@@ -0,0 +1,31 @@
+package qbit
+
+import (
+	"testing"
+
+	"ncore-hnr/internal/model"
+)
+
+func TestMatchByNameMatchesLongerReleaseName(t *testing.T) {
+	torrents := []model.QBitTorrent{
+		{Name: "The.Black.Dagger.Brotherhood.S01E01.720p.WEB.h264-GROUP", Hash: "match"},
+	}
+
+	match, ok := MatchByName("The Black Dagger Brotherhood S01E01 720p", torrents)
+	if !ok {
+		t.Fatal("expected qBittorrent release name to match nCore display name")
+	}
+	if match.Hash != "match" {
+		t.Fatalf("expected match hash %q, got %q", "match", match.Hash)
+	}
+}
+
+func TestMatchByNameDoesNotMatchDifferentEpisode(t *testing.T) {
+	torrents := []model.QBitTorrent{
+		{Name: "The.Black.Dagger.Brotherhood.S01E02.720p.WEB.h264-GROUP", Hash: "wrong"},
+	}
+
+	if _, ok := MatchByName("The Black Dagger Brotherhood S01E01 720p", torrents); ok {
+		t.Fatal("expected different episode not to match")
+	}
+}