fix(#1111): drop rusqlite bundled feature — use system libsqlite3

rusqlite was compiled with features=["bundled"] which embeds the
SQLite C source and compiles it via the cc crate on every fresh
dependency build. libsqlite3 is already in nativeBuildInputs (pkgs.sqlite
+ pkgs.pkg-config) so the system library is always available in the
nix sandbox. Dropping bundled removes the C compilation step from
the dep tree.

Cargo.toml

@@ -35,7 +35,7 @@ rmcp = { version = "1.7", default-features = false, features = [
   "macros",
   "transport-io",
 ] }
-rusqlite = { version = "0.37", features = ["bundled"] }
+rusqlite = { version = "0.37" }
 schemars = "1.0"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"