V45.39: fix installer khong cai VC++ redist -> VST FX 0x7E tren may sach

Root cause: bridges (/MD) import MSVCP140.dll/VCRUNTIME140*.dll nhung installer
KHONG bao gio cai VC++ redist. hooks.nsh dinh nghia macro 'customInstall'
- ten Tauri v2 khong goi (template dung NSIS_HOOK_POSTINSTALL) -> macro chet,
vc_redist.x64.exe khong duoc nhung, khong chay. May phat trien chay duoc vi
co MSVC BuildTools (redist san); may user sach: bridge khong start duoc ->
moi VST/VST3 FX khong load (GUI khong mo), plugin /MD khac (iZotope core...)
bao 0x7E.

Fix:
- hooks.nsh: doi macro thanh NSIS_HOOK_POSTINSTALL; vc_redist dong goi nhu
  bundle resource ->  (File tuong doi trong macro resolve theo thu muc
  installer.nsi sinh ra, khong phai src-tauri -  cung vay).
  ExecWait /install /quiet /norestart; xoa file sau khi cai xong (rc 0/3010).
- tauri.conf.json: resources + vc_redist.x64.exe; nsis installMode perMachine
  (vc_redist can elevation; DAW scan Program Files plugin dirs).

Verified: 7z l installer -> vc_redist.x64.exe embedded; installer.nsi insert
NSIS_HOOK_POSTINSTALL; INSTALLMODE perMachine; makensis OK. NSIS +387MB.
MSI (WiX) van khong cai redist - can cai tay tren may dung MSI.

src-tauri/hooks.nsh

@@ -1,7 +1,12 @@
 ; NSIS installer hooks — cai Microsoft Visual C++ Redistributable neu thieu
 ; (MSVCP140.dll missing). Dat vc_redist.x64.exe CANH tauri.conf.json
 ; (build_windows.ps1 tu tai ve neu chua co).
-!macro customInstall
-  File "/oname=$PLUGINSDIR\vc_redist.x64.exe" "vc_redist.x64.exe"
-  ExecWait '"$PLUGINSDIR\vc_redist.x64.exe" /install /quiet /norestart'
+!macro NSIS_HOOK_POSTINSTALL
+  ; vc_redist.x64.exe dong goi nhu bundle resource -> $INSTDIR (khong dung File:
+  ; path tuong doi trong macro resolve theo thu muc installer.nsi sinh ra).
+  ExecWait '"$INSTDIR\vc_redist.x64.exe" /install /quiet /norestart' $0
+  ${If} $0 = 0
+  ${OrIf} $0 = 3010
+    Delete "$INSTDIR\vc_redist.x64.exe"
+  ${EndIf}
 !macroend

src-tauri/tauri.conf.json

@@ -25,12 +25,14 @@
     "resources": {
       "resources/daw_engine": "daw_engine/",
       "binaries/libfluidsynth-3.dll": "libfluidsynth-3.dll",
-      "binaries/jpeg62.dll": "jpeg62.dll"
+      "binaries/jpeg62.dll": "jpeg62.dll",
+      "vc_redist.x64.exe": "vc_redist.x64.exe"
     },
     "externalBin": ["binaries/daw_vst_bridge", "binaries/fx_vst_bridge", "binaries/plugin_host"],
     "windows": {
       "nsis": {
-        "installerHooks": "hooks.nsh"
+        "installerHooks": "hooks.nsh",
+        "installMode": "perMachine"
       }
     }
   }