refactor: fold provider crate into engine

crates/tui/Cargo.toml

@@ -23,7 +23,6 @@ manifest = { workspace = true }
 secrets = { workspace = true }
 session-store = { workspace = true }
 fs4 = { workspace = true }
-provider = { workspace = true }
 ticket = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 minijinja = "2.19.0"

crates/tui/src/setup_model.rs

@@ -3,7 +3,7 @@ use std::io::{self, Write};
 use std::path::{Path, PathBuf};
 use std::process::ExitCode;
 
-use provider::catalog::{self, AuthHint, ModelEntry, ProviderEntry};
+use manifest::model_catalog::{self as catalog, AuthHint, ModelEntry, ProviderEntry};
 use toml::Value;
 use toml::map::Map;