feat: add auto doc via utiopia

src/routes/v1/chat.rs

@@ -11,6 +11,13 @@ use serde_json::Value;
 use crate::errors::OllamaError;
 use crate::state::app_state::AppState;
 
+#[utoipa::path(
+    post,
+    path = "/chat/completions",
+    responses(
+        (status = 200, description = "Chat completion", body = Value),
+    )
+)]
 pub async fn completions(
     State(state): State<AppState>,
     Json(body): Json<Value>,
@@ -73,6 +80,10 @@ fn ollama_err(e: OllamaError) -> (axum::http::StatusCode, String) {
             axum::http::StatusCode::BAD_REQUEST,
             "prompt is required and cannot be empty".to_string(),
         ),
+        OllamaError::MissingModel => (
+            axum::http::StatusCode::BAD_REQUEST,
+            "model is required and cannot be empty".to_string(),
+        ),
         OllamaError::ModelNotFound(m) => (
             axum::http::StatusCode::UNPROCESSABLE_ENTITY,
             format!("model '{m}' is not available — run `ollama pull {m}` first"),