Implement caching for remote instance proxies and enhance proxy request handling

pkg/server/handlers.go

@@ -4,6 +4,8 @@ import (
 	"llamactl/pkg/config"
 	"llamactl/pkg/manager"
 	"net/http"
+	"net/http/httputil"
+	"sync"
 	"time"
 )
 
@@ -11,6 +13,8 @@ type Handler struct {
 	InstanceManager manager.InstanceManager
 	cfg             config.AppConfig
 	httpClient      *http.Client
+	remoteProxies   map[string]*httputil.ReverseProxy // Cache of remote proxies by instance name
+	remoteProxiesMu sync.RWMutex
 }
 
 func NewHandler(im manager.InstanceManager, cfg config.AppConfig) *Handler {
@@ -20,5 +24,6 @@ func NewHandler(im manager.InstanceManager, cfg config.AppConfig) *Handler {
 		httpClient: &http.Client{
 			Timeout: 30 * time.Second,
 		},
+		remoteProxies: make(map[string]*httputil.ReverseProxy),
 	}
 }