transcode manager now handles multiple media servers

Transcodes/README-Transcoding.md

@@ -223,13 +223,58 @@ TRANSCODE_CHMOD="755"
 
 TRANSCODE_MANAGER_MODE="smart"   # smart | ramdisk | ssd
 
-TRANSCODE_CHECK_EMBY=true
-TRANSCODE_EMBY_CONTAINER="Emby"
+TRANSCODE_CHECK_EMBY=true        # skips threshold checks when no servers active
 
 TRANSCODE_DAILY_LOG="/boot/config/transcode_daily.db"
 TRANSCODE_LOG_RETENTION=90
 ```
 
+### Multi-Server Configuration — `TRANSCODE_SERVERS`
+
+The transcode manager supports any number of media servers sharing the same ramdisk scratch space. One server or ten — the same script handles it. The threshold decision is based on total ramdisk usage across all servers combined.
+
+```bash
+TRANSCODE_SERVERS=(
+    "Emby|http://localhost:8096|your-api-key|emby"
+    # "Emby-Jayred365|http://HOST2-IP:8096|his-api-key|emby"   # temporarily cover his Emby
+    # "Jellyfin|http://localhost:8097|jellyfin-api-key|jellyfin" # test Jellyfin instance
+    # "Plex|http://localhost:32400|plex-token|plex"              # Plex if needed
+)
+```
+
+**Format:** `"ContainerName|URL|APIKey|Type"`
+
+| Field | Description |
+|-------|-------------|
+| `ContainerName` | Exact Docker container name — used for running check |
+| `URL` | API base URL including port |
+| `APIKey` | Server API key or token |
+| `Type` | `emby` \| `jellyfin` \| `plex` — controls API endpoint format |
+
+**How it works with multiple servers:**
+
+Each media server writes its transcode sessions to its own subfolder inside `transcoding-temp`:
+
+```
+/mnt/ram-transcode/transcoding-temp/
+  E0D8DC/        ← Emby session (Live TV segment files)
+  abc123/        ← Jellyfin session
+  xyz789/        ← his Emby session
+```
+
+They never touch each other's files. The ramdisk is shared scratch space — each server is unaware of the others. The manager aggregates session counts from all servers and makes one threshold decision based on total ramdisk usage.
+
+**Each server container needs the shared propagation mount in Extra Parameters:**
+```
+--mount type=bind,source=/mnt/ram-transcode,target=/ext-ram-transcode,bind-propagation=shared
+```
+
+Set the transcode path in each server's settings to `/ext-ram-transcode` (or whatever target path you use).
+
+**Entries with placeholder API key values are skipped automatically** — comment out entries that aren't in use rather than removing them. The placeholders make it clear what's available to enable.
+
+**⚠️ Tdarr does NOT belong in this array.** Tdarr encodes full files — large working files would fill the ramdisk rapidly and cause constant flips. Keep Tdarr on SSD. A dedicated `tdarr_cleanup.sh` handles Tdarr orphan management separately.
+
 ### Sizing the Ramdisk
 
 `tmpfs` only uses RAM actually needed — `RAMDISK_SIZE` is a ceiling, not a reservation.