feat(desktop): 江南美术改为真实 PNG 图集

- scripts/make-jiangnan-art.py 生成三张原创透明 PNG：世界 256x32、角色 1024x48、内景 392x96
- VillageArt.fs 移除进程内像素烘焙，改为 BaseDirectory 加载图集并校验尺寸
- 内景渲染改用图集（地板/墙/窗/桌/床/屏/毯/柜），新增玩家专属 StrawHat 变体
- 内景新增地毯与柜子装饰，角色按 FeetPosition 定位
- fsproj 随包复制三张 PNG；m6c-package.sh 校验三张 PNG 进入交付包

1 files changed, 13 insertions, 0 deletions

diff --git a/src/LivingVillage.Desktop.Tests/PrototypeTests.fs b/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
index 842ab4a..c5b127f 100644
--- a/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
+++ b/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
@@ -416,3 +416,16 @@ type PrototypeTests () =
         Assert.IsTrue(manifestLines |> Array.forall (fun line -> line.Length = 1), "The CJK manifest must contain exactly one character per line.")
         CollectionAssert.AreEqual(characters, manifestLines |> Array.map (fun line -> line.[0]))
         Assert.IsTrue(File.Exists(runtimeAssetPath ()), sprintf "Missing atlas PNG: %s" (runtimeAssetPath ()))
+
+    [<TestMethod>]
+    member _.JiangnanArtAssetsArePackagedAsRealPngFiles () =
+        let requiredAssets =
+            [ "Assets/jiangnan-world.png"
+              "Assets/jiangnan-characters.png"
+              "Assets/jiangnan-interior.png" ]
+
+        let missing =
+            requiredAssets
+            |> List.filter (fun relativePath -> not (File.Exists(Path.Combine(AppContext.BaseDirectory, relativePath))))
+
+        Assert.AreEqual<string list>([], missing, sprintf "Missing Jiangnan PNG assets: %s" (String.concat ", " missing))