feat(desktop): 江南水乡河道横贯与波纹两帧

场景改为沿村蜿蜒水带（北岸凸湾、中段横贯、南段收窄），南北两岸石板路沿河展开，木桥三块纵跨全河连接民居门前石径；水面新增第二张波纹图块，按世界 tick/32 取模确定性交替，绘制无新增每帧分配。

1 files changed, 19 insertions, 3 deletions

diff --git a/scripts/make-jiangnan-art.py b/scripts/make-jiangnan-art.py
index 98e357c..26db3fc 100644
--- a/scripts/make-jiangnan-art.py
+++ b/scripts/make-jiangnan-art.py
@@ -2,7 +2,7 @@
 """Deterministic pixel-art atlases for LivingVillage.Desktop.
 
 Generates three RGBA PNGs into src/LivingVillage.Desktop/Assets:
-  jiangnan-world.png     416x32  (13 ground/prop tiles, 32px each)
+  jiangnan-world.png     448x32  (14 ground/prop tiles, 32px each)
   jiangnan-characters.png 1024x48 (4 variants x 4 directions x 2 frames, 32x48 cells)
   jiangnan-interior.png  392x96  (variable-size bottom-aligned interior cells)
 
@@ -99,7 +99,7 @@ def verify_png(path, expected_w, expected_h):
 
 
 def build_world_atlas():
-    c = Canvas(416, 32)
+    c = Canvas(448, 32)
     tile = 32
 
     def slot(index):
@@ -294,6 +294,22 @@ def build_world_atlas():
     c.rect(x0 + 19, 18, 3, 3, (196, 158, 74, 255))
     c.rect(x0 + 6, 29, 20, 3, (83, 52, 39, 255))
 
+    x0 = slot(13)
+    c.rect(x0, 0, 32, 32, water)
+    c.rect(x0 + 4, 3, 2, 26, water_deep)
+    c.rect(x0 + 19, 8, 2, 22, water_deep)
+    for y in (9, 20, 29):
+        for x in range(3, 29):
+            if (x * 3 + y) % 5 != 0:
+                c.set(x0 + x, y, water_light)
+    for y in (14, 25):
+        for x in range(5, 27):
+            if (x + y * 2) % 6 == 0:
+                c.set(x0 + x, y, water_deep)
+    for sx, sy in ((9, 6), (24, 13), (15, 24), (5, 19)):
+        c.set(x0 + sx, sy, (214, 231, 238, 255))
+        c.set(x0 + sx + 1, sy, (214, 231, 238, 120))
+
     return c
 
 
@@ -513,7 +529,7 @@ def build_interior_atlas():
 def main():
     ASSET_DIR.mkdir(parents=True, exist_ok=True)
     targets = [
-        ("jiangnan-world.png", build_world_atlas(), 416, 32),
+        ("jiangnan-world.png", build_world_atlas(), 448, 32),
         ("jiangnan-characters.png", build_character_atlas(), 1024, 48),
         ("jiangnan-interior.png", build_interior_atlas(), 392, 96),
     ]