fix: fail fast when API listen fails

Bind synchronously and surface errors instead of logging them.

api/server.go

@@ -3,6 +3,7 @@ package api
 import (
 	"context"
 	"fmt"
+	"net"
 	"net/http"
 	"time"
 
@@ -90,9 +91,16 @@ func (s *Server) Start(ctx context.Context) error {
 
 	logger.Infof("Starting API server on %s", s.httpServer.Addr)
 
+	// Bind synchronously so listen failures (e.g. port already in use) are
+	// returned to the caller instead of being silently logged in a goroutine.
+	ln, err := net.Listen("tcp", s.httpServer.Addr)
+	if err != nil {
+		return fmt.Errorf("failed to listen on %s: %w", s.httpServer.Addr, err)
+	}
+
 	// 在 goroutine 中启动服务器
 	go func() {
-		if err := s.httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		if err := s.httpServer.Serve(ln); err != nil && err != http.ErrServerClosed {
 			logger.Errorf("API server error: %v", err)
 		}
 	}()

cmd/run.go

@@ -88,7 +88,7 @@ func initAll(ctx context.Context) (<-chan struct{}, error) {
 		}
 	}
 	if err := api.Start(ctx); err != nil {
-		logger.Error("Failed to start API server", "error", err)
+		logger.Fatal("Failed to start API server", "error", err)
 	}
 	return bot.Init(ctx), nil
 }