rename app data API

Align docs, examples, and tests with AppData and NoData

Update handler, scene, runner, and plugin generics to the new naming

Ignore .codex and record the cleanup in the changelog

doc.go

@@ -13,17 +13,17 @@ Core concepts:
 
 Example usage:
 
-	bot, err := laniakea.NewBot[*mydb.DBContext](laniakea.LoadOptsFromEnv())
+	bot, err := laniakea.NewBot[*mydb.AppData](laniakea.LoadOptsFromEnv())
 	if err != nil {
 	    return err
 	}
-	bot.DatabaseContext(myDB).
+	bot.SetAppData(myDB).
 	    AddUpdateType(tgapi.UpdateTypeMessage).
 	    AddPrefixes("/", "!").
 	    AddPlugins(&startPlugin, &helpPlugin).
 	    AddMiddleware(authMiddleware, logMiddleware).
 	    AddRunner(cleanupRunner).
-	    AddL10n(l10n.New())
+	    SetL10n(l10n.New())
 
 	return bot.Run()