stacks: add .env + .env.secrets.ctmpl for media stacks

Adds real Vault Agent secret templates and non-secret env vars for
all 15 media stacks. Sanitized real leaks found in the source data:
kodi's real username and real hostnames+IPs in KODI_INSTANCES,
tdarr's real IP and hostname reference, immich's real username -
replaced with generic values (IPs use the RFC 5737 documentation
range, 192.0.2.0/24, rather than another real-looking address).

Every var cross-checked against what its actual public compose file
references before writing, learned from the platform batch.

stacks/media/tdarr/.env

@@ -0,0 +1,20 @@
+# Exposed HTTP ports
+HTTP_PORT=8265      #webUI
+HTTP_PORT1=8266     #server
+HTTP_PORT2=8267     #Internal_node
+HTTP_PORT3=8268     #node
+
+# System time zone
+TZ=Etc/UTC
+
+# ID's
+PUID=1000
+PGID=1000
+UMASK=022
+
+# Environment
+serverIP=192.0.2.10
+serverPort=8266
+webUIPort=8265
+internalNode=true
+nodeName=internal-node