Watchdogs/ folder + host conf rename

Move all watchdog scripts to a dedicated Watchdogs/ folder:
  Docker_Essentials/docker_watchdog.sh   → Watchdogs/
  unRAID_Essentials/system_watchdog.sh   → Watchdogs/
  unRAID_Essentials/resource_watchdog.sh → Watchdogs/
  Orchestrators/watchdog_orchestrator.sh → Watchdogs/
  Tools/watchdog_skip_list_manager.sh    → Watchdogs/

Rename host config files:
  master_host1.conf → host1.conf
  master_host2.conf → host2.conf

Update all references across the ecosystem:
  master.conf: WATCHDOG_ORCHESTRATOR_SCRIPTS paths → Watchdogs/
  load_config.sh: host*.conf glob + all comments
  git_pull_execute.sh: sparse checkout glob + all comments
  Partnership/ssh_setup.sh: HOST_CONF path construction
  user_script_plug-in.sh: all script paths + per-host conf path
  common.sh, README.md, README-User_Script_Plug-in.md: comment refs
  All Partnership, Fallback, Monitors, Transcodes, Tools scripts: comment refs

Tools/emby_database_repair.sh

@@ -55,7 +55,7 @@
 # CONFIGURATION
 # ==============================================================================================
 #
-# master_host*.conf
+# host*.conf
 #
 #   HOST*_EMBY_CONTAINER
 #       Name of the Emby Docker container on this host.
@@ -122,7 +122,7 @@ fi
 detect_hosts
 
 if [[ -z "${EMBY_CONTAINER:-}" ]]; then
-    error "EMBY_CONTAINER not set for $MY_ID — check HOST*_EMBY_CONTAINER in master_host*.conf"
+    error "EMBY_CONTAINER not set for $MY_ID — check HOST*_EMBY_CONTAINER in host*.conf"
     exit 1
 fi
 
@@ -135,7 +135,7 @@ EMBY_CONFIG_HOST=$(timeout "$DOCKER_TIMEOUT" docker inspect "$EMBY_CONTAINER" 2>
 
 if [[ -z "$EMBY_CONFIG_HOST" ]]; then
     error "Could not detect Emby config path from Docker mounts"
-    error "Is $EMBY_CONTAINER the correct container name? Check HOST*_EMBY_CONTAINER in master_host*.conf"
+    error "Is $EMBY_CONTAINER the correct container name? Check HOST*_EMBY_CONTAINER in host*.conf"
     exit 1
 fi