Fix frontend build crash by updating getNodes to getUserAccessibleNodes and restore production service sync

feat(ui): allow drag-and-drop of file paths to chat input

Auto-cleanup dead systemlink & FS Cache Reflowing, Bump OTA Version to 1.0.76

Refactor AI Config and Fix Login failure: Migrated services to a structured api directory, updated backend schemas for multiple TTS/STT providers, and improved settings/chat UI coverage.

refactor(frontend): move shared components into shared/components