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/Manual-Tools.md

@@ -432,7 +432,7 @@ library.db-wal      — write-ahead log (uncommitted transactions)
                       the main library.db is also affected
 ```
 
-### Configuration (master_host*.conf)
+### Configuration (host*.conf)
 
 ```bash
 HOST1_EMBY_CONTAINER="Emby"    # aliased by detect_hosts() → EMBY_CONTAINER
@@ -470,7 +470,7 @@ without triggering any error — until you try to read that specific file. By th
 Run monthly. Also run after any disk replacement or power event.
 Safe to run while the system is in use — scrub runs at low I/O priority.
 
-### Configuration (master_host*.conf)
+### Configuration (host*.conf)
 
 ```bash
 HOST1_ZFS_REPORT_IGNORE_POOLS=(