refactor: rename resource_manager → resource_watchdog, RM_ → RW_

Consistent naming with the watchdog family (system_watchdog, docker_watchdog).
File renamed, all RM_ config variables and internal references updated to RW_
across master.conf, master_host1.conf, common.sh, docker_watchdog.sh,
system_watchdog.sh, watchdog_orchestrator.sh, and sunday_morning_coffee_report.sh.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Orchestrators/watchdog_orchestrator.sh

@@ -6,12 +6,12 @@
 # Schedule: * * * * * (every minute via User Scripts plugin)
 #
 # ── EXECUTION ORDER ───────────────────────────────────────────────────────────────────────────
-#   1. resource_manager.sh   — reduce system pressure intelligently
+#   1. resource_watchdog.sh   — reduce system pressure intelligently
 #   2. docker_watchdog.sh    — heal containers with freed resources
 #   3. system_watchdog.sh    — reboot if all else fails (last line of defense)
 #
 # ── WHY ORDER MATTERS ─────────────────────────────────────────────────────────────────────────
-#   Resource Manager first — frees RAM and CPU before healing attempts container restarts.
+#   Resource Watchdog first — frees RAM and CPU before healing attempts container restarts.
 #                            Containers restarted into a resource-pressured system just fail again.
 #   Docker Watchdog second — restarts with pressure already reduced, more likely to stabilise.
 #   System Watchdog last   — only triggers if prior layers could not resolve the issue.
@@ -63,7 +63,7 @@ acquire_lock
 
 detect_hosts
 
-RESOURCE_MANAGER="$ECOSYSTEM_ROOT/unRAID_Essentials/resource_manager.sh"
+RESOURCE_WATCHDOG="$ECOSYSTEM_ROOT/unRAID_Essentials/resource_watchdog.sh"
 DOCKER_WATCHDOG="$ECOSYSTEM_ROOT/Docker_Essentials/docker_watchdog.sh"
 SYSTEM_WATCHDOG="$ECOSYSTEM_ROOT/unRAID_Essentials/system_watchdog.sh"
 
@@ -88,7 +88,7 @@ if [[ "$SHOW_STATUS" == true ]]; then
     echo ""
     echo "── Sub-scripts ──"
     for pair in \
-        "Resource Manager:$RESOURCE_MANAGER" \
+        "Resource Watchdog:$RESOURCE_WATCHDOG" \
         "Docker Watchdog:$DOCKER_WATCHDOG" \
         "System Watchdog:$SYSTEM_WATCHDOG"; do
         label="${pair%%:*}"
@@ -150,7 +150,7 @@ run_watchdog() {
     fi
 }
 
-run_watchdog "Resource Manager" "$RESOURCE_MANAGER"
+run_watchdog "Resource Watchdog" "$RESOURCE_WATCHDOG"
 run_watchdog "Docker Watchdog"  "$DOCKER_WATCHDOG"
 run_watchdog "System Watchdog"  "$SYSTEM_WATCHDOG"