feat: 添加用户注册功能，包括表单验证和路由注册

backend/docs/docs.go

@@ -3885,6 +3885,39 @@ const docTemplate = `{
                 }
             }
         },
+        "/v1/auth/register": {
+            "post": {
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Web"
+                ],
+                "summary": "用户注册",
+                "parameters": [
+                    {
+                        "description": "form",
+                        "name": "form",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/dto.RegisterForm"
+                        }
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "成功",
+                        "schema": {
+                            "$ref": "#/definitions/quyun_v2_app_http_web_dto.LoginResponse"
+                        }
+                    }
+                }
+            }
+        },
         "/v1/auth/token": {
             "get": {
                 "consumes": [
@@ -4906,6 +4939,27 @@ const docTemplate = `{
                 }
             }
         },
+        "dto.RegisterForm": {
+            "type": "object",
+            "properties": {
+                "confirmPassword": {
+                    "description": "ConfirmPassword 确认密码；必须与 Password 一致，避免误输入导致无法登录。",
+                    "type": "string"
+                },
+                "password": {
+                    "description": "Password 明文密码；后端会在创建用户时自动加密（bcrypt）。",
+                    "type": "string"
+                },
+                "username": {
+                    "description": "Username 用户名；需全局唯一（users.username）；建议仅允许字母/数字/下划线，且长度在合理范围内。",
+                    "type": "string"
+                },
+                "verifyCode": {
+                    "description": "VerifyCode 验证码（预留字段）；当前版本仅透传/占位，不做后端校验。",
+                    "type": "string"
+                }
+            }
+        },
         "dto.SuperContentItem": {
             "type": "object",
             "properties": {