fix: update vtcode-core dependency to use version instead of path for crates.io publishing

Author: vinhnx

Cargo.toml

@@ -42,7 +42,7 @@ uninlined_format_args = "deny"
 unwrap_used = "deny"
 
 [dependencies]
-vtcode-core = { path = "vtcode-core" }
+vtcode-core = "0.8.1"
 anyhow = "1.0"
 clap = { version = "4.5", features = ["derive"] }
 serde_json = "1.0"