RAG: Auto-inject knowledge MCP server on team deploy

[sre-helmcode]

Description

Modify deployTeamAsync in handlers_teams.go:

• Check if org has ready documents
• If yes: ensure Qdrant + RAG MCP running, connect to team network
• Inject knowledge-base MCP server config into AGENT_MCP_SERVERS env (in-memory, not persisted to DB)

Modify StopTeam:

• Disconnect Qdrant + RAG MCP from team network (no auto-stop)

Acceptance Criteria

• Teams with org docs get knowledge-base MCP auto-injected
• Teams without org docs are unaffected
• StopTeam disconnects networks cleanly
• MCP config not persisted to team's mcp_servers DB field