improvement(sns-media): 内置 WeFlow WASM 资源并切换朋友圈图片解密实现

- 内置 wasm_video_decode 资源并纳入打包
- Node helper 优先使用包内 weflow_wasm 目录
- 朋友圈图片远程解密改为走 WeFlow WxIsaac64 全量 XOR
- 补充对应测试并更新纯 Python fallback 说明

Author: 2977094657

pyproject.toml

@@ -43,6 +43,9 @@ include = [
     "src/wechat_decrypt_tool/native/VoipEngine.dll",
     "src/wechat_decrypt_tool/native/wcdb_api.dll",
     "src/wechat_decrypt_tool/native/WCDB.dll",
+    "src/wechat_decrypt_tool/native/weflow_wasm/weflow_wasm_keystream.js",
+    "src/wechat_decrypt_tool/native/weflow_wasm/wasm_video_decode.js",
+    "src/wechat_decrypt_tool/native/weflow_wasm/wasm_video_decode.wasm",
 ]
 
 [tool.uv]

src/wechat_decrypt_tool/isaac64.py

@@ -10,9 +10,9 @@
 still attempt to generate a keystream when the WASM helper is unavailable.
 
 Notes:
-- Moments *image* decryption is handled via `wcdb_api.dll` (`wcdb_decrypt_sns_image`)
-  because "ISAAC-64 full-file XOR" is not reliably reproducible for images across
-  different versions/samples.
+- Production Moments image/video decryption should prefer the vendored
+  WxIsaac64/WASM path. This pure-Python implementation is only a fallback when
+  Node/WASM is unavailable.
 - This ISAAC-64 implementation may not perfectly match WxIsaac64; treat it as
   best-effort.
 """