feat: 基础框架搭建完毕

internal/apperror/errors.go

@@ -0,0 +1,13 @@
+// Package apperror defines safe application errors shared across module boundaries.
+package apperror
+
+import "errors"
+
+var (
+	ErrInvalidInput    = errors.New("invalid input")
+	ErrUnauthenticated = errors.New("authentication required")
+	ErrForbidden       = errors.New("permission denied")
+	ErrConflict        = errors.New("already exists")
+	ErrNotFound        = errors.New("not found")
+	ErrUnavailable     = errors.New("service unavailable")
+)