remove preact and create setup wizard

apps/server/internal/httpserver/admin_handlers.go

@@ -15,6 +15,10 @@ type adminUserInput struct {
 	Role        string `json:"role"`
 }
 
+type adminSettingsInput struct {
+	SignupsEnabled bool `json:"signupsEnabled"`
+}
+
 func (s *Server) handleAdminLogin(w http.ResponseWriter, r *http.Request) {
 	var input adminUserInput
 	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
@@ -95,7 +99,6 @@ func (s *Server) handleAdminWorkspace(w http.ResponseWriter, r *http.Request) {
 			"databasePath":  s.config.Database.Path,
 			"documentCount": len(documents),
 			"userCount":     len(users),
-			"webDistDir":    s.config.Web.DistDir,
 		},
 		"documents": documents,
 	})
@@ -113,6 +116,30 @@ func (s *Server) handleAdminWorkspaceSync(w http.ResponseWriter, r *http.Request
 	})
 }
 
+func (s *Server) handleAdminSettings(w http.ResponseWriter, r *http.Request) {
+	settings, err := s.auth.GetInstanceSettings(r.Context())
+	if err != nil {
+		writeJSONWithStatus(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"settings": settings})
+}
+
+func (s *Server) handleAdminSettingsUpdate(w http.ResponseWriter, r *http.Request) {
+	principal, _ := requirePrincipal(r)
+	var input adminSettingsInput
+	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
+		writeJSONWithStatus(w, http.StatusBadRequest, map[string]string{"error": "invalid json"})
+		return
+	}
+	settings, err := s.auth.UpdateSignupsEnabled(r.Context(), principal, input.SignupsEnabled)
+	if err != nil {
+		writeJSONWithStatus(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"settings": settings})
+}
+
 func (s *Server) normalizeAdminUserInput(input adminUserInput) (docs.UserRecord, bool) {
 	email := strings.TrimSpace(strings.ToLower(input.Email))
 	if email == "" {