feat: inject build version/commit into scraper and UI at docker build time

- Go scraper: Version/Commit vars in main.go, injected via -ldflags; Server struct + New() updated; GET /health and new GET /api/version expose them
- UI Dockerfile: ARG BUILD_VERSION/BUILD_COMMIT → ENV PUBLIC_BUILD_VERSION/PUBLIC_BUILD_COMMIT for SvelteKit
- Footer: shows version+short commit when not 'dev' (text-zinc-800, subtle)
- docker-compose: args blocks for scraper and ui build sections pass $GIT_TAG/$GIT_COMMIT

scraper/cmd/scraper/main.go

@@ -47,6 +47,13 @@ import (
 	"github.com/libnovel/scraper/internal/storage"
 )
 
+// Build-time version info — injected via -ldflags during docker build.
+// Falls back to "dev" / "unknown" when built without -ldflags (local dev).
+var (
+	Version = "dev"
+	Commit  = "unknown"
+)
+
 func main() {
 	logLevel := slog.LevelInfo
 	if v := os.Getenv("LOG_LEVEL"); v != "" {
@@ -183,7 +190,7 @@ func run(log *slog.Logger) error {
 			"pocketbase_url", pbCfg.BaseURL,
 			"pocketbase_email", pbCfg.AdminEmail,
 		)
-		srv := server.New(addr, oCfg, nf, log, store, kokoroURL, kokoroVoice)
+		srv := server.New(addr, oCfg, nf, log, store, kokoroURL, kokoroVoice, Version, Commit)
 		return srv.ListenAndServe(ctx)
 
 	case "save-browse":