fix: independent persist executor + reset pending_push on failure

chore: upload app/services/vector_store.py

chore: upload app/services/embedding.py

chore: upload app/services/reranker.py

chore: upload app/services/chunking.py

chore: upload app/services/ingestion.py

chore: upload app/api/chat.py

chore: upload app/api/__init__.py

chore: upload app/api/documents.py

chore: upload app/api/health.py

chore: upload app/api/sessions.py

chore: upload app/streaming/sse.py

chore: upload app/streaming/__init__.py

chore: upload app/streaming/events.py

chore: upload app/models/schemas.py

chore: upload app/models/__init__.py

chore: upload app/models/db.py

chore: upload app/agents/state.py

chore: upload app/agents/nodes.py

chore: upload app/agents/prompts.py

chore: upload app/agents/__init__.py

chore: upload app/agents/graph.py

chore: upload app/agents/tools.py

chore: upload app/core/errors.py

chore: upload app/core/__init__.py

chore: upload app/core/paths.py

chore: upload app/core/logging.py

chore: upload app/llm/base.py

chore: upload app/llm/factory.py

chore: upload app/llm/__init__.py

chore: upload app/llm/minimax.py

chore: upload app/main.py

chore: upload app/__init__.py

chore: upload app/config.py

chore: upload app/deps.py

chore: upload pyproject.toml

chore: upload Dockerfile

chore: upload requirements.txt

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy

chore: clear old backend before redeploy