docs(deploy) : add deployment guide and MCP connection tutorial

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/release-artefact.yml

@@ -45,6 +45,7 @@ jobs:
           set -euo pipefail
           mkdir -p release
           tar -czf "release/lesstime-${GITHUB_REF_NAME}.tar.gz" \
+            .env \
             bin \
             config \
             migrations \