feat(bootstrap): refactor runtime dependency management and add lazy loading for binary store and vector index

feat(agent): update import for agent session service
feat(openai): add context truncation check in OpenAI answer generator
docs(README): update frontend environment file conventions
fix(vite): default local frontend development to local backend

frontend/src/pages/RagChat/CitedAnswer.tsx

@@ -1,4 +1,4 @@
-import React, { useRef } from 'react';
+import React from 'react';
 import { useTheme } from '../../contexts';
 import type { RetrievalData } from '../../types';