fix: use sh instead of bash for postinstall and bin placeholders

bash may not be in PATH on Windows (only Git Bash's sh is guaranteed).
- Change postinstall from bash to sh in package.json
- Convert [[ ]] to POSIX [ ] in postinstall templates
- Change placeholder shebangs from #!/bin/bash to #!/bin/sh

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: elrrrrrrr

vendor/scripts/npm-utoo.sh

@@ -40,8 +40,8 @@ mkdir -p "$ENTRY_DIR/bin"
 for binary in utoo ut; do
     # Unix version
     cat > "$ENTRY_DIR/bin/$binary" << 'EOF'
-#!/bin/bash
-echo "This is a placeholder binary for $binary. The actual binary will be installed via postinstall script."
+#!/bin/sh
+echo "This is a placeholder binary. The actual binary will be installed via postinstall script."
 exit 1
 EOF
     chmod +x "$ENTRY_DIR/bin/$binary"
@@ -56,7 +56,7 @@ done
 
 # create utx shell script that executes utoo x
 cat > "$ENTRY_DIR/bin/utx" << 'EOF'
-#!/bin/bash
+#!/bin/sh
 utoo x "$@"
 EOF
 chmod +x "$ENTRY_DIR/bin/utx"

vendor/templates/postinstall.sh.template

@@ -1,16 +1,16 @@
-#!/bin/bash
+#!/bin/sh
 
 # get cpu & os info
-if [[ "$OSTYPE" == "msys" ]] || [[ "$OSTYPE" == "win32" ]]; then  
-    OS="win32"  
+if [ "$OSTYPE" = "msys" ] || [ "$OSTYPE" = "win32" ]; then
+    OS="win32"
     # Use PROCESSOR_ARCHITECTURE on Windows
-    if [[ "$PROCESSOR_ARCHITECTURE" == "AMD64" ]] || [[ "$PROCESSOR_ARCHITECTURE" == "x86_64" ]]; then  
-        ARCH="x64"  
-    elif [[ "$PROCESSOR_ARCHITECTURE" == "ARM64" ]]; then  
-        ARCH="arm64"  
-    else  
-        ARCH="x64"  
-    fi  
+    if [ "$PROCESSOR_ARCHITECTURE" = "AMD64" ] || [ "$PROCESSOR_ARCHITECTURE" = "x86_64" ]; then
+        ARCH="x64"
+    elif [ "$PROCESSOR_ARCHITECTURE" = "ARM64" ]; then
+        ARCH="arm64"
+    else
+        ARCH="x64"
+    fi
 else  
     OS=$(uname -s | tr '[:upper:]' '[:lower:]')  
     ARCH=$(uname -m)  

vendor/templates/postinstall.utoo.sh.template

@@ -1,16 +1,16 @@
-#!/bin/bash
+#!/bin/sh
 
-# Get CPU & OS info - compatible with Git Bash on Windows  
-if [[ "$OSTYPE" == "msys" ]] || [[ "$OSTYPE" == "win32" ]]; then  
-    OS="win32"  
-    # On Windows, use PROCESSOR_ARCHITECTURE  
-    if [[ "$PROCESSOR_ARCHITECTURE" == "AMD64" ]] || [[ "$PROCESSOR_ARCHITECTURE" == "x86_64" ]]; then  
-        ARCH="x64"  
-    elif [[ "$PROCESSOR_ARCHITECTURE" == "ARM64" ]]; then  
-        ARCH="arm64"  
-    else  
-        ARCH="x64"  # default  
-    fi  
+# Get CPU & OS info - POSIX compatible (works with sh on Windows Git)
+if [ "$OSTYPE" = "msys" ] || [ "$OSTYPE" = "win32" ]; then
+    OS="win32"
+    # On Windows, use PROCESSOR_ARCHITECTURE
+    if [ "$PROCESSOR_ARCHITECTURE" = "AMD64" ] || [ "$PROCESSOR_ARCHITECTURE" = "x86_64" ]; then
+        ARCH="x64"
+    elif [ "$PROCESSOR_ARCHITECTURE" = "ARM64" ]; then
+        ARCH="arm64"
+    else
+        ARCH="x64"  # default
+    fi
 else  
     OS=$(uname -s | tr '[:upper:]' '[:lower:]')  
     ARCH=$(uname -m)  

vendor/templates/utoo.package.json.template

@@ -21,6 +21,6 @@
   "os": ["darwin", "linux", "win32"],
   "cpu": ["x64", "arm64"],
   "scripts": {
-    "postinstall": "bash ./postinstall.sh"
+    "postinstall": "sh ./postinstall.sh"
   }
 }