Initial commit: Gitea Project Management System

Features:
- Complete project management system with Epic/Story/Task hierarchy
- Vue.js 3 + Element Plus frontend with kanban board
- Go backend with Gin framework and GORM
- OAuth2 integration with Gitea
- Docker containerization with MySQL
- RESTful API for project, task, and user management
- JWT authentication and authorization
- Responsive web interface with dashboard

internal/models/user.go

@@ -0,0 +1,96 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type User struct {
+	ID          uint      `json:"id" gorm:"primaryKey"`
+	GiteaUserID *uint     `json:"gitea_user_id" gorm:"uniqueIndex"`
+	Username    string    `json:"username" gorm:"unique;not null"`
+	Email       string    `json:"email" gorm:"not null"`
+	FullName    string    `json:"full_name"`
+	AvatarURL   string    `json:"avatar_url"`
+	Role        string    `json:"role" gorm:"default:'developer'"`
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+type UserRole string
+
+const (
+	RoleAdmin     UserRole = "admin"
+	RoleManager   UserRole = "manager"
+	RoleDeveloper UserRole = "developer"
+	RoleTester    UserRole = "tester"
+	RoleViewer    UserRole = "viewer"
+)
+
+func (u *User) BeforeCreate(tx *gorm.DB) error {
+	return nil
+}
+
+func (u *User) GetOwnedProjects() ([]Project, error) {
+	var projects []Project
+	err := DB.Where("owner_id = ?", u.ID).Find(&projects).Error
+	return projects, err
+}
+
+func (u *User) GetJoinedProjects() ([]Project, error) {
+	var projects []Project
+	err := DB.Joins("JOIN project_members ON projects.id = project_members.project_id").
+		Where("project_members.user_id = ?", u.ID).
+		Find(&projects).Error
+	return projects, err
+}
+
+func (u *User) GetAssignedTasks() ([]Task, error) {
+	var tasks []Task
+	err := DB.Where("assignee_id = ?", u.ID).Find(&tasks).Error
+	return tasks, err
+}
+
+func CreateUser(user *User) error {
+	return DB.Create(user).Error
+}
+
+func GetUserByID(id uint) (*User, error) {
+	var user User
+	err := DB.First(&user, id).Error
+	return &user, err
+}
+
+func GetUserByUsername(username string) (*User, error) {
+	var user User
+	err := DB.Where("username = ?", username).First(&user).Error
+	return &user, err
+}
+
+func GetUserByGiteaID(giteaUserID uint) (*User, error) {
+	var user User
+	err := DB.Where("gitea_user_id = ?", giteaUserID).First(&user).Error
+	return &user, err
+}
+
+func UpdateUser(user *User) error {
+	return DB.Save(user).Error
+}
+
+func DeleteUser(id uint) error {
+	return DB.Delete(&User{}, id).Error
+}
+
+func ListUsers(offset, limit int) ([]User, int64, error) {
+	var users []User
+	var total int64
+
+	err := DB.Model(&User{}).Count(&total).Error
+	if err != nil {
+		return nil, 0, err
+	}
+
+	err = DB.Offset(offset).Limit(limit).Find(&users).Error
+	return users, total, err
+}