feat: 新增更多地图瓦片的下载，用于优化地图显示

internal/radar/scheduler.go

@@ -370,13 +370,27 @@ func runTilesFromNMC(ctx context.Context, opts Options) error {
 	dateStr := local.Format("20060102")
 	hh := local.Format("15")
 	mm := local.Format("04")
-	// Prepare tile list: primary (opts or default Nanning) + Guangzhou (7/40/104) + Wuhan (7/42/104)
+	// Prepare tile list: primary (opts or default Nanning) + a few defaults + optional config aliases
 	z, y, x := opts.Z, opts.Y, opts.X
 	if z == 0 && y == 0 && x == 0 {
 		z, y, x = 7, 40, 102
 	}
 	type tcoord struct{ z, y, x int }
-	tiles := []tcoord{{z, y, x}, {7, 40, 104}, {7, 42, 104}}
+	tiles := []tcoord{
+		{z, y, x}, // primary
+		{7, 40, 104},
+		{7, 42, 104},
+		{7, 40, 103},
+		{7, 39, 102},
+	}
+	// Append from config aliases, if present (dedup later)
+	if cfg := config.GetConfig(); cfg != nil {
+		for _, a := range cfg.Radar.Aliases {
+			if a.Z > 0 {
+				tiles = append(tiles, tcoord{a.Z, a.Y, a.X})
+			}
+		}
+	}
 	// de-duplicate if same
 	seen := map[string]bool{}
 	for _, tc := range tiles {