style: fix formatting issues

- Add missing newlines at end of files
- Fix indentation in ssl.go
- Remove extra blank lines

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/server/pool_test.go

@@ -140,7 +140,6 @@ func TestPoolConcurrentSubmit(t *testing.T) {
 
 	for range 100 {
 		wg.Go(func() {
-
 			_ = p.Submit(nil, func(_ *fasthttp.RequestCtx) {
 				counter.Add(1)
 			})

internal/server/server.go

@@ -447,7 +447,6 @@ func (s *Server) startSingleMode() error {
 
 	s.fastServer = s.createFastServer(serverCfg, s.handler)
 
-
 	s.running = true
 
 	// 创建监听器并保存，用于热升级
@@ -578,7 +577,6 @@ func (s *Server) startVHostMode() error {
 
 	s.fastServer = s.createFastServer(serverCfg, s.handler)
 
-
 	s.running = true
 
 	// 创建监听器并保存，用于热升级
@@ -678,7 +676,6 @@ func (s *Server) startMultiServerMode() error {
 			// 创建 fasthttp.Server
 			fastSrv := s.createFastServer(serverCfg, h)
 
-
 			// 检查 SSL 配置
 			if serverCfg.SSL.Cert != "" && serverCfg.SSL.Key != "" {
 				tlsManager, err := ssl.NewTLSManager(&serverCfg.SSL)