chore: move offline release assets to standalone repository

.gitignore

@@ -65,10 +65,7 @@ offline-backend-20260512/data/
 offline-backend-20260512/deerflow-backend-offline-image-20260505.tar
 offline-backend-20260512/extensions_config.json
 offline-backend-20260512/skills/
-# Canonical DeerFlow-only offline release assets.  The base wheelhouse is
-# versioned so a clean checkout can reproduce the fully offline bundle.
-!offline-backend-20260512/wheelhouse/
-!offline-backend-20260512/wheelhouse/**
+offline-backend-20260512/wheelhouse/
 offline-backend-20260512/backend/.deer-flow/data/*.db
 offline-backend-20260512/backend/.deer-flow/data/*.db-*
 offline-backend-20260512/backend/.deer-flow/*
@@ -122,19 +119,7 @@ offline-backend-20260512/backend/tests/*
 !offline-backend-20260512/backend/tests/test_enterprise_research_tasks.py
 # Position-roundtable per-turn write/present cap (weak-model duplicate artifacts).
 !offline-backend-20260512/backend/tests/test_position_artifact_cap.py
-# Keep only the canonical DeerFlow-only deployment implementation and the
-# three shared build inputs it consumes.  Other historical deploy variants
-# remain local-only.
-deploy/*
-!deploy/linux-docker-offline-deerflow-only/
-!deploy/linux-docker-offline-deerflow-only/**
-deploy/linux-docker-offline-deerflow-only/**/__pycache__/
-deploy/linux-docker-offline-deerflow-only/**/*.pyc
-!deploy/linux-docker-offline/
-deploy/linux-docker-offline/*
-!deploy/linux-docker-offline/Dockerfile.backend
-!deploy/linux-docker-offline/Dockerfile.frontend
-!deploy/linux-docker-offline/sanitize_release_sources.py
+deploy
 .history
 
 # Cloned third-party repos (local only)