Update Canary to v1.5.0 with generated credentials

[schjonhaug]

Summary

• Update Canary to v1.5.0 using the official Docker image tags
• Generate a persistent Canary admin password and JWT secret under /mnt/hdd/mynode/canary
• Pass the generated secrets into Canary with canary.env
• Show Canary credentials on the myNode app info page
• Write/read the installed Canary version marker so the info page does not show error
• Write the runtime Docker Compose file from install/pre-start scripts so the app does not depend on packaged app_data at runtime

Testing

• Built the standalone package with mynode-sdk build canary
• Verified shell syntax with bash -n for install/pre/uninstall scripts
• Verified Python syntax with python3 -m py_compile canary/www/python/canary.py
• Sideload-tested the rebuilt package on a real myNode device
• Confirmed Canary installs as v1.5.0 and the service turns green
• Confirmed myNode shows username admin@local and a generated password
• Confirmed login succeeds with the generated credentials
• Confirmed restart keeps the same credentials working