Init world. Basic registry API server

Work in progress .
This commit adds the core registry service implementation with methods to:
- Retrieve all registry entries
- List entries with cursor-based pagination
- Fetch specific server details by ID

internal/api/server.go

@@ -0,0 +1,48 @@
+package api
+
+import (
+	"context"
+	"log"
+	"net/http"
+
+	"github.com/modelcontextprotocol/registry/internal/api/router"
+	"github.com/modelcontextprotocol/registry/internal/config"
+	"github.com/modelcontextprotocol/registry/internal/service"
+)
+
+// Server represents the HTTP server
+type Server struct {
+	config   *config.Config
+	registry service.RegistryService
+	router   *http.ServeMux
+	server   *http.Server
+}
+
+// NewServer creates a new HTTP server
+func NewServer(cfg *config.Config, registryService service.RegistryService) *Server {
+	// Create router with all API versions registered
+	mux := router.New(cfg, registryService)
+
+	server := &Server{
+		config:   cfg,
+		registry: registryService,
+		router:   mux,
+		server: &http.Server{
+			Addr:    cfg.ServerAddress,
+			Handler: mux,
+		},
+	}
+
+	return server
+}
+
+// Start begins listening for incoming HTTP requests
+func (s *Server) Start() error {
+	log.Printf("HTTP server starting on %s", s.config.ServerAddress)
+	return s.server.ListenAndServe()
+}
+
+// Shutdown gracefully shuts down the server
+func (s *Server) Shutdown(ctx context.Context) error {
+	return s.server.Shutdown(ctx)
+}