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>

n8n/compose.yaml

@@ -3,8 +3,8 @@ services:
     image: ${N8N_IMAGE:-n8nio/n8n:latest}
     restart: ${N8N_RESTART:-unless-stopped}
     volumes:
-      - ${VOL_PATH}/n8n/data:/home/node/.n8n
-      - ${VOL_PATH}/n8n/files:/files
+      - ${VOL_PATH:-/data}/n8n/data:/home/node/.n8n
+      - ${VOL_PATH:-/data}/n8n/files:/files
     environment:
       - GENERIC_TIMEZONE=${TZ:-America/Vancouver}
       - TZ=${TZ:-America/Vancouver}