feat: slskd reconnect guard in downloaders_reset, mass v2 sync

- downloaders_reset: connection check block before slskd API sections;
  triggers PUT /api/v0/server reconnect if disconnected, polls 60s,
  gates Stuck Searches and Dead Transfer Records on SLSKD_CONNECTED
- Sync all modified/new/deleted files from v2 refactor across Docker_Essentials,
  Media, Monitors, Partnership, Rsync, Tools, Transcodes, unRAID_Essentials,
  common.sh, master confs, and new Manual/README docs

master_host1.conf

@@ -99,6 +99,32 @@
         "Authelia-Secondary|9092"
     )
 
+# XML templates (from this server's templates-user/) pushed to mirror during onboard.
+# These become the mirror's active auth stack, backed by the rsync-synced appdata.
+# Update filename if Lldap is renamed to drop the host suffix.
+    HOST1_PARTNERSHIP_AUTH_STACK=(
+        # Dependencies first — Mariadb/Redis must be healthy before Authelia starts
+        "my-Mariadb-Authelia.xml"
+        "my-Mariadb-Authelia-Secondary.xml"
+        "my-Redis-Authelia.xml"
+        "my-Redis-Authelia-Secondary.xml"
+        # Auth apps — deployed after their deps are confirmed healthy
+        "my-Authelia.xml"
+        "my-Authelia-Secondary.xml"
+        "my-NginxProxyManager.xml"
+        "my-Lldap-Gmer4Lfe.xml"
+    )
+
+# XML templates pushed to mirror for the arr stack during onboard.
+# Deps (e.g. databases) first if any — same ordering rule as auth stack.
+    HOST1_PARTNERSHIP_ARR_STACK=(
+        # "my-Sonarr.xml"
+        # "my-Radarr.xml"
+        # "my-Lidarr.xml"
+        # "my-Prowlarr.xml"
+        # "my-Bazarr.xml"
+    )
+
 # Paths HOST2 should collect during the grace window after offboard.
 # Notified on offboard — no auto-deletion, HOST2 must collect manually within PARTNERSHIP_GRACE_HOURS.
     HOST1_PARTNERSHIP_MIRROR_BACKUPS=(