SQLite + sqlite-vec Persistence

Name: Memo
Author: Buğra Akdemir

Unified Storage: Vector embeddings and metadata live in the same SQLite database.
ANN Indexing: vec0 virtual table provides approximate nearest neighbor search with O(log N) query time.
ACID Compliance: Built-in transaction support ensures atomic writes and data integrity.
Go Fallback: If vec0 extension is unavailable, brute-force cosine similarity fallback.