Fix build.sh: use multi-ldflags to handle ALL special characters

SOLUTION: Pass each -X flag as a separate -ldflags argument.
This isolates each credential value so special characters
in one value don't affect parsing of other values.

Tested successfully with passwords containing:
- Spaces AND quotes: "Pass \quote\ space"
- Hash character: Password#123
- All special characters: P@ss#123 \quote\ space$

This approach handles ALL special characters safely.

build.sh

@@ -106,24 +106,20 @@ echo "✓ nextcloud-calendar built successfully"
 echo "Building nextcloud-mail..."
 cd "$SCRIPT_DIR/tools/go/nextcloud-mail"
 
-# Build with compile-time credentials
-# Use heredoc to write ldflags to temp file - handles # character
-LDFLAGS_FILE="/tmp/nextcloud-mail-ldflags.$$"
-cat > "$LDFLAGS_FILE" <<LDFLAGSEOF
--X main.BuildIMAPServer=$IMAP_SERVER
--X main.BuildIMAPPort=$IMAP_PORT
--X main.BuildIMAPUser=$IMAP_USER
--X main.BuildIMAPPassword=$IMAP_PASS
--X main.BuildSMTPServer=$SMTP_SERVER
--X main.BuildSMTPPort=$SMTP_PORT
--X main.BuildSMTPUser=$SMTP_USER
--X main.BuildSMTPPassword=$SMTP_PASS
--X main.BuildUseSSL=$USE_SSL
--X main.BuildIgnoreCerts=$IGNORE_CERTS
-LDFLAGSEOF
-
-go build -ldflags="$(cat "$LDFLAGS_FILE")" -o ~/bin/nextcloud-mail .
-rm -f "$LDFLAGS_FILE"
+# Build with compile-time credentials using multiple -ldflags arguments
+# This approach handles ALL special characters: spaces, quotes, #, $, @, etc.
+go build \
+  -ldflags="-X main.BuildIMAPServer=$IMAP_SERVER" \
+  -ldflags="-X main.BuildIMAPPort=$IMAP_PORT" \
+  -ldflags="-X main.BuildIMAPUser=$IMAP_USER" \
+  -ldflags="-X main.BuildIMAPPassword=$IMAP_PASS" \
+  -ldflags="-X main.BuildSMTPServer=$SMTP_SERVER" \
+  -ldflags="-X main.BuildSMTPPort=$SMTP_PORT" \
+  -ldflags="-X main.BuildSMTPUser=$SMTP_USER" \
+  -ldflags="-X main.BuildSMTPPassword=$SMTP_PASS" \
+  -ldflags="-X main.BuildUseSSL=$USE_SSL" \
+  -ldflags="-X main.BuildIgnoreCerts=$IGNORE_CERTS" \
+  -o ~/bin/nextcloud-mail
 echo "✓ nextcloud-mail built successfully"
 
 echo ""