normalize all stacks to conventions

- VOL_PATH always defaults to /data; vscode/opencode VOL_PROJECTS nests it
- TZ defaults to America/Vancouver (was UTC in etherpad, ntfy, redis)
- compose section order fixed (volumes before environment, command after networks)
- all default secrets are the literal ChangeThisPassword (grep-friendly,
  users must change them); removed a real key from ollama sample.env
- sample.env synced with compose: missing vars added with defaults, dead vars removed
- invoiceninja_dev/openarchiver_dev: app services had no environment block,
  wired all sample.env vars through so the stacks actually work
- opencode: sample.env OLLAMA_HOST renamed to OLLAMA_HOST_URL to match compose
- TZ values unquoted consistently

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ntfy_dev/compose.yaml

@@ -8,7 +8,7 @@ services:
       - ${VOL_PATH:-/data}/ntfy-cache:/var/cache/ntfy
       - /etc/localtime:/etc/localtime:ro
     environment:
-      - TZ=${TZ:-UTC}
+      - TZ=${TZ:-America/Vancouver}
       - NTFY_BASE_URL=${NTFY_BASE_URL:-http://localhost}
       - NTFY_CACHE_FILE=${NTFY_CACHE_FILE:-/var/lib/ntfy/cache.db}
       - NTFY_AUTH_FILE=${NTFY_AUTH_FILE:-/var/lib/ntfy/auth.db}