chore: add Arcane and Dockhand TrueNAS compose files

arcane-truenas.env.example

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+# Arcane TrueNAS environment example for Wheelz's HomeLab.
+# Copy to arcane-truenas.env on TrueNAS/Portainer and fill runtime-only values there.
+# Do not commit real secrets.
+
+ARCANE_IMAGE=ghcr.io/getarcaneapp/manager
+ARCANE_TAG=latest
+ARCANE_HTTP_PORT=3552
+TZ=America/Chicago
+
+# Wheelz TrueNAS Docker directory pattern.
+TRUENAS_DOCKER_ROOT=/mnt/HomeStorage02/Docker
+PUID=568
+PGID=568
+
+# Arcane secrets. Generate on the deployment host and do not commit real values.
+# Example commands:
+#   openssl rand -hex 32
+#   openssl rand -hex 32
+ENCRYPTION_KEY=replace_me_with_a_random_32_byte_hex_value
+JWT_SECRET=replace_me_with_a_random_32_byte_hex_value
+
+# Arcane Compose project storage. This path is mounted into the container at the
+# same path so Docker can resolve project files from the host side.
+ARCANE_PROJECTS_DIRECTORY=/mnt/HomeStorage02/Docker/Arcane/projects