Initial TopDeck: self-hosted ranked favorites

A single Go binary with SQLite that serves a public page of the owner's
ranked lists (movies, TV, albums, songs, video games, theater) and a
login-gated editor.

- Lists of 1–65,535 entries (100 recommended), several per category
- Search-to-add via TMDB, TheTVDB, IGDB, Deezer/MusicBrainz, Wikipedia;
  manual entry as a fallback
- Theater entries carry a production (Broadway, tour, …), venue and cast
- Artwork cached locally; URL override and uploads
- Drag, arrow and type-a-rank reordering; paginated for long lists
- 12 theme presets plus custom CSS
- First-run setup code or env-provided admin; bcrypt, rate-limited login,
  CSRF-guarded JSON API
- Dockerfile and docker-compose.yml

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/store/categories.go

@@ -0,0 +1,51 @@
+package store
+
+// Category describes one kind of list. The Key is what's stored in the
+// database; everything else is presentation.
+type Category struct {
+	Key      string `json:"key"`
+	Label    string `json:"label"`    // plural, e.g. "Movies"
+	Singular string `json:"singular"` // e.g. "Movie"
+	Icon     string `json:"icon"`     // name of an inline SVG icon
+	Aspect   string `json:"aspect"`   // "poster" (2:3) or "square" (1:1)
+	// SubtitleHint labels the free-text subtitle field in the editor.
+	SubtitleHint string `json:"subtitleHint"`
+}
+
+var Categories = []Category{
+	{Key: "movie", Label: "Movies", Singular: "Movie", Icon: "film", Aspect: "poster", SubtitleHint: "Director"},
+	{Key: "tv", Label: "TV Shows", Singular: "TV Show", Icon: "tv", Aspect: "poster", SubtitleHint: "Network"},
+	{Key: "album", Label: "Albums", Singular: "Album", Icon: "disc", Aspect: "square", SubtitleHint: "Artist"},
+	{Key: "song", Label: "Songs", Singular: "Song", Icon: "music", Aspect: "square", SubtitleHint: "Artist"},
+	{Key: "game", Label: "Video Games", Singular: "Video Game", Icon: "gamepad", Aspect: "poster", SubtitleHint: "Developer"},
+	{Key: "theater", Label: "Theater", Singular: "Show", Icon: "masks", Aspect: "poster", SubtitleHint: "Creators"},
+}
+
+func CategoryByKey(key string) (Category, bool) {
+	for _, c := range Categories {
+		if c.Key == key {
+			return c, true
+		}
+	}
+	return Category{}, false
+}
+
+// TheaterProductions are the suggested production labels for theater items.
+// The owner can also type anything else.
+var TheaterProductions = []string{
+	"Broadway",
+	"Broadway Revival",
+	"Off-Broadway",
+	"West End",
+	"West End Revival",
+	"Off-West End",
+	"North American Tour",
+	"US National Tour",
+	"UK & Ireland Tour",
+	"Australian Production",
+	"International Tour",
+	"Regional",
+	"Concert / Staged Reading",
+	"Filmed / Pro-shot",
+	"Original Cast Recording",
+}