Secrets moved to .env.local (gitignored). Added .env.example for new developers.
Also added .idea/ and docker/.env.docker.local to .gitignore and removed them from tracking.
Tickets: T-001, T-013, T-018
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Generic encryption key name for shared use across Gitea and BookStack
token encryption.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>