feat: 添加默认配置文件创建功能，确保首次启动时可用

src/config/mod.rs

@@ -10,8 +10,11 @@ use std::str::FromStr;
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct Config {
+    #[serde(default)]
     pub providers: HashMap<String, ProviderConfig>,
+    #[serde(default)]
     pub models: HashMap<String, ModelConfig>,
+    #[serde(default)]
     pub agents: HashMap<String, AgentConfig>,
     #[serde(default)]
     pub time: TimeConfig,
@@ -886,9 +889,12 @@ impl Config {
                 tracing::info!(path = %fallback.display(), "Config loaded from fallback path");
                 fs::read_to_string(fallback)?
             } else {
-                return Err(Box::new(ConfigError::ConfigNotFound(
-                    path.to_string_lossy().to_string(),
-                )));
+                // Auto-create a minimal config on first startup
+                tracing::info!(
+                    path = %path.display(),
+                    "Config not found, auto-creating minimal config"
+                );
+                Self::create_default_config(path)?
             }
         };
         let content = resolve_env_placeholders(&content);
@@ -906,6 +912,46 @@ impl Config {
         Ok(config)
     }
 
+    /// Create the default config file with a minimal template on first startup.
+    /// This ensures the gateway can start and the user can configure via web UI.
+    fn create_default_config(path: &Path) -> Result<String, Box<dyn std::error::Error>> {
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent)?;
+        }
+
+        let default_config = serde_json::json!({
+            "providers": {
+                "default": {
+                    "type": "openai",
+                    "base_url": "https://api.openai.com/v1",
+                    "api_key": "<YOUR_API_KEY>",
+                    "extra_headers": {}
+                }
+            },
+            "models": {
+                "default": {
+                    "model_id": "gpt-4o",
+                    "temperature": 0.7,
+                    "context_window_tokens": 128000
+                }
+            },
+            "agents": {
+                "default": {
+                    "provider": "default",
+                    "model": "default"
+                }
+            }
+        });
+
+        let content = serde_json::to_string_pretty(&default_config)?;
+        fs::write(path, &content)?;
+        tracing::info!(
+            path = %path.display(),
+            "Created default config file — please configure your API key and model"
+        );
+        Ok(content)
+    }
+
     pub fn get_provider_config(&self, agent_name: &str) -> Result<LLMProviderConfig, ConfigError> {
         let agent = self
             .agents

src/gateway/mod.rs

@@ -31,7 +31,7 @@ pub mod ws;
 use axum::{Router, routing};
 use std::collections::HashMap;
 use std::sync::Arc;
-use tokio::net::TcpListener;
+use tokio::net::TcpSocket;
 use tokio::sync::Semaphore;
 use tower_http::services::ServeDir;
 
@@ -223,8 +223,16 @@ pub async fn run(
             .with_state(state.clone())
     };
 
-    let addr = format!("{}:{}", bind_host, bind_port);
-    let listener = TcpListener::bind(&addr).await?;
+    let addr: std::net::SocketAddr = format!("{}:{}", bind_host, bind_port).parse()?;
+    let listener = {
+        let socket = match addr {
+            std::net::SocketAddr::V4(_) => TcpSocket::new_v4()?,
+            std::net::SocketAddr::V6(_) => TcpSocket::new_v6()?,
+        };
+        socket.set_reuseaddr(true)?;
+        socket.bind(addr)?;
+        socket.listen(1024)?
+    };
     tracing::info!(address = %addr, "Gateway listening");
 
     // Graceful shutdown / restart signal