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

Tools/container_data_export.sh

@@ -2,46 +2,67 @@
 # ==============================================================================================
 # ============================= Container Data Export ==========================================
 # ==============================================================================================
-# Exports a container's appdata directory to a compressed tar archive.
-# Stops the container before archiving and restarts it after — ensures clean consistent backup.
-# Verifies the archive after creation — confirms backup is valid before restarting container.
 #
-# ── WHEN TO USE ───────────────────────────────────────────────────────────────────────────────
-#   - Before major container updates (roll back if update goes wrong)
-#   - Before pool migrations or disk replacements
-#   - When archiving a container being removed from the stack
-#   - Before destructive operations on appdata (database migrations etc.)
-#   - One-off backup of a specific container without running full backup
+# PURPOSE
+# ─────────────────────────────────────────────────────────────────────────────
+# Exports a container's appdata directory to a compressed tar archive. Stops
+# the container before archiving and restarts it after — ensures a clean,
+# consistent backup. Use before major updates, pool migrations, destructive
+# appdata operations, or when archiving a container being removed from the stack.
 #
-# ── OUTPUT FILE NAMING ────────────────────────────────────────────────────────────────────────
-#   ContainerName_YYYY-MM-DD_HH-MM.tar.gz
-#   Timestamp in filename — run multiple times safely, no overwrite ✅
+# Output: ContainerName_YYYY-MM-DD_HH-MM.tar.gz — timestamped, no overwrite.
 #
-# ── SPACE CHECK ───────────────────────────────────────────────────────────────────────────────
-# Estimates required space as appdata size × 1.1 (10% buffer).
-# Compressed archive will typically be much smaller — this is a conservative floor.
-# gzip compression ratio depends heavily on content — database files compress well,
-# media files do not. If output is on a media share estimate may be pessimistic.
+# ==============================================================================================
+# DESIGN PRINCIPLES
+# ==============================================================================================
 #
-# ── ARCHIVE VERIFICATION ──────────────────────────────────────────────────────────────────────
-# After creation the archive is tested with tar --test-file before restarting the container.
-# If verification fails the container is still restarted (data unchanged) and an error logged.
-# A corrupt archive is not a usable backup — do not assume the archive is good without this.
+# Archive Verification Before Restart
+#   The archive is tested with tar --test-file before the container is restarted.
+#   A corrupt archive is not a usable backup — this catches tar failures, I/O
+#   errors, and truncated writes before declaring success. If verification fails,
+#   the container is still restarted (appdata is unchanged) and an error logged.
 #
-# ── SAFEGUARDS ────────────────────────────────────────────────────────────────────────────────
-#   DOCKER_TIMEOUT         — docker calls protected against hung daemon
-#   Container restart rule — was running → restart | was stopped → leave stopped ✅
-#   Archive cleanup        — partial archive removed on tar failure
-#   Archive verification   — tar --test-file after creation
-#   Container restart on   — any failure path still restarts container if it was running
-#   validate_unraid_cmd    — notify validated before use
-#   Silent on success      — only problems produce visible output
+# Conservative Space Estimate
+#   Required space is estimated as appdata size × 1.1 (10% buffer). The actual
+#   compressed archive will typically be much smaller — database files compress
+#   well, media files do not. The estimate is a conservative floor, not a
+#   prediction.
+#
+# ==============================================================================================
+# OPERATIONAL SAFEGUARDS
+# ==============================================================================================
+#
+# Container Restart Rule
+#   Tracks whether the container was running before the export. Running containers
+#   are restarted after completion; already-stopped containers are left stopped.
+#   The restart happens on every exit path — a failed tar does not leave the
+#   container stuck stopped.
+#
+# Partial Archive Cleanup
+#   If tar fails, the incomplete archive is removed. A partial archive is worse
+#   than no archive — it can look valid but restore to an incomplete state.
+#
+# Docker Timeout
+#   DOCKER_TIMEOUT (default: 30s) caps all docker calls. Guards against a hung
+#   daemon blocking the script indefinitely.
+#
+# Notification Validated
+#   validate_unraid_cmd confirms the notify script is present before use.
+#
+# ==============================================================================================
+# RUNTIME MODES
+# ==============================================================================================
+#
+# container_data_export.sh ContainerName /path/to/appdata /path/to/output/dir
+#     Stop container, create archive, verify, restart container.
+#     Example: container_data_export.sh Emby /mnt/media-servers/.../Emby /mnt/user/Backups/
+#
+# container_data_export.sh ContainerName /path/to/appdata /path/to/output/dir --dry-run
+#     Show what would be archived and estimated size. No container stop, no tar.
+#
+# container_data_export.sh ContainerName /path/to/appdata /path/to/output/dir --log
+#     Verbose output: space check, tar progress, verification result.
 #
-# ── USAGE ─────────────────────────────────────────────────────────────────────────────────────
-#   container_data_export.sh ContainerName /path/to/appdata /path/to/output/dir
-#   container_data_export.sh Emby /mnt/media-servers/Media_Server/Emby /mnt/user/Backups/
-#   container_data_export.sh Emby /mnt/media-servers/Media_Server/Emby /mnt/user/Backups/ --dry-run
-#   container_data_export.sh Emby /mnt/media-servers/Media_Server/Emby /mnt/user/Backups/ --log
 # ==============================================================================================
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"