Backend: Fix organization API endpoints and RBAC

- Fix member list API response format to match frontend expectations
- Fix join requests API response format
- Add proper JSON tags to Invitation struct
- Grant OrgManage permission to admin role for proper RBAC

These changes ensure frontend-backend API contracts are aligned and admins can manage organizations.

go_cloud/internal/database/db.go

@@ -117,14 +117,14 @@ type Membership struct {
 }
 
 type Invitation struct {
-	ID         uuid.UUID
-	OrgID      uuid.UUID
-	InvitedBy  uuid.UUID
-	Username   string
-	Role       string
-	CreatedAt  time.Time
-	ExpiresAt  time.Time
-	AcceptedAt *time.Time
+	ID         uuid.UUID  `json:"id"`
+	OrgID      uuid.UUID  `json:"orgId"`
+	InvitedBy  uuid.UUID  `json:"invitedBy"`
+	Username   string     `json:"username"`
+	Role       string     `json:"role"`
+	CreatedAt  time.Time  `json:"createdAt"`
+	ExpiresAt  time.Time  `json:"expiresAt"`
+	AcceptedAt *time.Time `json:"acceptedAt"`
 }
 
 type JoinRequest struct {

go_cloud/internal/http/routes.go

@@ -888,6 +888,21 @@ func activityHandler(w http.ResponseWriter, r *http.Request, db *database.DB) {
 	json.NewEncoder(w).Encode(activities)
 }
 
+type memberResponse struct {
+	UserID    string    `json:"userId"`
+	OrgID     string    `json:"orgId"`
+	Role      string    `json:"role"`
+	CreatedAt time.Time `json:"createdAt"`
+	User      userInfo  `json:"user"`
+}
+
+type userInfo struct {
+	ID          string `json:"id"`
+	Username    string `json:"username"`
+	DisplayName string `json:"displayName"`
+	Email       string `json:"email"`
+}
+
 func listMembersHandler(w http.ResponseWriter, r *http.Request, db *database.DB) {
 	orgID := r.Context().Value(middleware.OrgKey).(uuid.UUID)
 
@@ -898,8 +913,25 @@ func listMembersHandler(w http.ResponseWriter, r *http.Request, db *database.DB)
 		return
 	}
 
+	// Convert to proper response format
+	var response []memberResponse
+	for _, m := range members {
+		response = append(response, memberResponse{
+			UserID:    m.Membership.UserID.String(),
+			OrgID:     m.Membership.OrgID.String(),
+			Role:      m.Membership.Role,
+			CreatedAt: m.Membership.CreatedAt,
+			User: userInfo{
+				ID:          m.User.ID.String(),
+				Username:    m.User.Username,
+				DisplayName: m.User.DisplayName,
+				Email:       m.User.Email,
+			},
+		})
+	}
+
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(members)
+	json.NewEncoder(w).Encode(response)
 }
 
 func updateMemberRoleHandler(w http.ResponseWriter, r *http.Request, db *database.DB, auditLogger *audit.Logger) {
@@ -1126,6 +1158,16 @@ func createJoinRequestHandler(w http.ResponseWriter, r *http.Request, db *databa
 	json.NewEncoder(w).Encode(joinRequest)
 }
 
+type joinRequestResponse struct {
+	ID          string    `json:"id"`
+	OrgID       string    `json:"orgId"`
+	UserID      string    `json:"userId"`
+	InviteToken *string   `json:"inviteToken"`
+	RequestedAt time.Time `json:"requestedAt"`
+	Status      string    `json:"status"`
+	User        userInfo  `json:"user"`
+}
+
 func listJoinRequestsHandler(w http.ResponseWriter, r *http.Request, db *database.DB) {
 	orgID := r.Context().Value(middleware.OrgKey).(uuid.UUID)
 
@@ -1136,8 +1178,27 @@ func listJoinRequestsHandler(w http.ResponseWriter, r *http.Request, db *databas
 		return
 	}
 
+	// Convert to proper response format
+	var response []joinRequestResponse
+	for _, req := range requests {
+		response = append(response, joinRequestResponse{
+			ID:          req.JoinRequest.ID.String(),
+			OrgID:       req.JoinRequest.OrgID.String(),
+			UserID:      req.JoinRequest.UserID.String(),
+			InviteToken: req.JoinRequest.InviteToken,
+			RequestedAt: req.JoinRequest.RequestedAt,
+			Status:      req.JoinRequest.Status,
+			User: userInfo{
+				ID:          req.User.ID.String(),
+				Username:    req.User.Username,
+				DisplayName: req.User.DisplayName,
+				Email:       req.User.Email,
+			},
+		})
+	}
+
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(requests)
+	json.NewEncoder(w).Encode(response)
 }
 
 func acceptJoinRequestHandler(w http.ResponseWriter, r *http.Request, db *database.DB, auditLogger *audit.Logger) {

go_cloud/internal/permission/permission.go

@@ -22,7 +22,7 @@ const (
 
 var rolePermissions = map[string][]Permission{
 	"owner":  {FileRead, FileWrite, FileDelete, DocumentView, DocumentEdit, OrgManage},
-	"admin":  {FileRead, FileWrite, FileDelete, DocumentView, DocumentEdit},
+	"admin":  {FileRead, FileWrite, FileDelete, DocumentView, DocumentEdit, OrgManage},
 	"member": {FileRead, DocumentView},
 }