fix: add missing meta_name implementation and fix compilation errors

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/digest.rs

@@ -1,7 +1,5 @@
-use anyhow::Result;
 use sha2::{Digest, Sha256};
 use std::time::Instant;
-use rusqlite::Connection;
 
 use crate::meta_plugin::MetaPlugin;