rename appdata-Failover→appdata-Fallback in docs; critical sync 15→30min; transcode 3→7min

appdata-Failover → appdata-Fallback:
  All .md files updated — scripts and confs already used appdata-Fallback.
  Share was renamed; docs were the only stale references.

critical_sync_maintenance.sh: */15 → */30, 96/day → 48/day:
  critical_sync_maintenance.sh header, master.conf, host1/2.conf comments,
  Orchestrators README, User Script Plug-in README, Partnership README/manual/script,
  Docker_Essentials README/downloaders_reset.sh, Fallback README,
  weekly_sync_maintenance.sh, user_script_plug-in.sh all updated.

rsync_emby_failover User Script superseded:
  Emby dirty sync was already in HOST1_CRITICAL_SYNC_SHARES — it now runs inside
  critical_sync_maintenance.sh every 30min alongside auth sync and partnership check.
  Section in User Script Plug-in README marked for deletion from plugin.

transcode_management.sh: */3 → */7:
  transcode_management.sh, transcode_manager.sh, transcode_cleanup.sh headers,
  Transcodes README/manual, Orchestrators README, User Script Plug-in README,
  user_script_plug-in.sh all updated.

user_script_plug-in.sh

@@ -17,8 +17,8 @@
 #   array_started.sh                    at array start — launches ALL startup scripts in order
 #   array_stopping.sh                 at array stop  — graceful shutdown sequence
 #   watchdog_orchestrator.sh          every minute   — resource + docker + system watchdog
-#   transcode_management.sh           every 3 min   — cleanup then manager (order critical)
-#   critical_sync_maintenance.sh      every 15 min  — auth + Emby dirty sync + partnership
+#   transcode_management.sh           every 7 min   — cleanup then manager (order critical)
+#   critical_sync_maintenance.sh      every 30 min  — auth + Emby dirty sync + partnership
 #   intermediate_sync_maintenance.sh  every 4 hours — arr library sync + artwork fetch
 #   daily_sync_maintenance.sh         1am daily     — git + rsync + media + restart
 #   rsync.sh --profile=emby-fallback  every 30 min  — Emby watch state dirty sync
@@ -174,7 +174,7 @@
 
 
 # ── TRANSCODE MANAGEMENT ──────────────────────────────────────────────────────────────────────
-# Schedule:   */3 * * * *  (every 3 minutes)
+# Schedule:   */7 * * * *  (every 7 minutes)
 # Background: YES
 #
 # Cleanup first, then manager — order is non-negotiable. Stale segment files are removed
@@ -202,15 +202,15 @@
 
 
 # ── CRITICAL SYNC MAINTENANCE ─────────────────────────────────────────────────────────────────
-# Schedule:   */15 * * * *  (every 15 minutes)
+# Schedule:   */30 * * * *  (every 30 minutes)
 # Background: YES
 #
-# Keeps failover-critical data current on HOST2. 15 minutes is the maximum staleness
+# Keeps fallback-critical data current on HOST2. 30 minutes is the maximum staleness
 # for the auth stack and Emby watch states. Run on HOST1 — bidirectional via detect_hosts().
 #
 # rsync Critical-Data:
 #   Auth stack to HOST2: NPM proxy rules, TLS certs, LLDAP user accounts,
-#   Authelia config and policies. HOST2 auth always within 15min of HOST1.
+#   Authelia config and policies. HOST2 auth always within 30min of HOST1.
 #
 # rsync Emby dirty sync:
 #   Watch states, user activity, library delta — Emby stays running on both sides.
@@ -221,7 +221,7 @@
 #   Reads remote state file. Increments offline counter on failed sync.
 #   Triggers auto-offboard at PARTNERSHIP_OFFLINE_THRESHOLD (30 days) unreachable.
 #
-# Silent on clean cycles: runs 96 times per day, no output when healthy.
+# Silent on clean cycles: runs 48 times per day, no output when healthy.
 #
 # bash /mnt/user/appdata/unraid_scripts/Orchestrators/critical_sync_maintenance.sh
 
@@ -684,7 +684,7 @@
 # bash /mnt/user/appdata/unraid_scripts/Docker_Essentials/docker_update_remaining.sh
 
 # downloaders_reset.sh — maintenance reset for all download clients on this server
-# Called every 15 minutes by critical_sync_maintenance.sh via CRITICAL_MAINTENANCE_SCRIPTS.
+# Called every 30 minutes by critical_sync_maintenance.sh via CRITICAL_MAINTENANCE_SCRIPTS.
 # Host-aware: sections skip gracefully if a downloader URL is empty for this server.
 #
 # slskd:
@@ -1297,13 +1297,13 @@
 # * * * * *      every minute:
 #   Orchestrators/watchdog_orchestrator.sh
 #
-# */3 * * * *    every 3 minutes:
+# */7 * * * *    every 7 minutes:
 #   Orchestrators/transcode_management.sh
 #
 # */10 * * * *   every 10 minutes:
 #   Watchdogs/System/webgui_watchdog.sh
 #
-# */15 * * * *   every 15 minutes:
+# */30 * * * *   every 30 minutes:
 #   Orchestrators/critical_sync_maintenance.sh
 #
 # */30 * * * *   every 30 minutes: