Fix watchdog PID file to store correct background process PID

- Capture PID of background main() process with MAIN_PID=
- Store correct PID in watchdog PID file instead of main() function PID
- Prevent PID file from containing exited process PID
- Fix both wssshd and wssshc watchdogs
- Watchdog PID file now contains PID of actual running process

wsssh-server/debian/wssshd-watchdog

@@ -198,8 +198,9 @@ main() {
 
     log_message "START validation passed, proceeding with watchdog initialization"
 
-    # Store watchdog PID
-    echo $$ > "$WATCHDOG_PID_FILE"
+    # Store watchdog PID (use the background process PID captured by parent)
+    echo $MAIN_PID > "$WATCHDOG_PID_FILE"
+    log_message "Created PID file with PID: $MAIN_PID"
 
     log_message "Watchdog started for $DAEMON_NAME"
     log_message "Check interval: $CHECK_INTERVAL seconds"
@@ -254,8 +255,9 @@ case "$1" in
         fi
         echo "Calling main() function..."
 
-        # Run main() function in background
+        # Run main() function in background and capture its PID
         main &
+        MAIN_PID=$!
 
         # Give it a moment to start
         sleep 1

wssshtools/debian/wssshc-watchdog

@@ -193,8 +193,9 @@ main() {
 
     log_message "START validation passed, proceeding with watchdog initialization"
 
-    # Store watchdog PID
-    echo $$ > "$WATCHDOG_PID_FILE"
+    # Store watchdog PID (use the background process PID captured by parent)
+    echo $MAIN_PID > "$WATCHDOG_PID_FILE"
+    log_message "Created PID file with PID: $MAIN_PID"
 
     log_message "Watchdog started for $DAEMON_NAME"
     log_message "Check interval: $CHECK_INTERVAL seconds"
@@ -249,8 +250,9 @@ case "$1" in
         fi
         echo "Calling main() function..."
 
-        # Run main() function in background
+        # Run main() function in background and capture its PID
         main &
+        MAIN_PID=$!
 
         # Give it a moment to start
         sleep 1