feat: implement semantic search functionality and engine for project similarity analysis

feat: implement database synchronization queue with SQL triggers and a background worker for automated FAISS index rebuilding.

Update: semantic_search.py

feat: add similarity model package with feature extraction, deduplication, and semantic comparison tools

feat: implement modular hybrid similarity engine with semantic search and feature-based ranking components

update

update

fix: resolve FAISS index not found and TypeError by anchoring paths to __file__ and casting Path to str

update

update .gitignore and add scheduler and sync_projects services

add fiels