Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/api/rest/errors.go

@@ -0,0 +1,51 @@
+package rest
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// ErrorResponse represents an API error response
+type ErrorResponse struct {
+	Error ErrorDetail `json:"error"`
+}
+
+// ErrorDetail contains error details
+type ErrorDetail struct {
+	Code    string `json:"code"`
+	Message string `json:"message"`
+	Details string `json:"details,omitempty"`
+}
+
+// writeError writes an error response
+func writeError(w http.ResponseWriter, statusCode int, code, message string) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(ErrorResponse{
+		Error: ErrorDetail{
+			Code:    code,
+			Message: message,
+		},
+	})
+}
+
+// writeNotFound writes a 404 error response
+func writeNotFound(w http.ResponseWriter, resource string) {
+	writeError(w, http.StatusNotFound, "NOT_FOUND", resource+" not found")
+}
+
+// writeInternalError writes a 500 error response
+func writeInternalError(w http.ResponseWriter, message string) {
+	writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", message)
+}
+
+// writeUnauthorized writes a 401 error response
+func writeUnauthorized(w http.ResponseWriter) {
+	writeError(w, http.StatusUnauthorized, "UNAUTHORIZED", "Authentication required")
+}
+
+// writeForbidden writes a 403 error response
+func writeForbidden(w http.ResponseWriter) {
+	writeError(w, http.StatusForbidden, "FORBIDDEN", "Access denied")
+}
+