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/common.go

@@ -0,0 +1,152 @@
+package models
+
+import (
+	"time"
+)
+
+type Comment struct {
+	ID         uint      `json:"id" gorm:"primaryKey"`
+	EntityType string    `json:"entity_type" gorm:"type:varchar(50)"`
+	EntityID   uint      `json:"entity_id"`
+	UserID     uint      `json:"user_id"`
+	Content    string    `json:"content"`
+	User       User      `json:"user" gorm:"foreignKey:UserID"`
+	CreatedAt  time.Time `json:"created_at"`
+	UpdatedAt  time.Time `json:"updated_at"`
+}
+
+type EntityType string
+
+const (
+	EntityTypeProject EntityType = "project"
+	EntityTypeEpic    EntityType = "epic"
+	EntityTypeStory   EntityType = "story"
+	EntityTypeTask    EntityType = "task"
+)
+
+type Tag struct {
+	ID        uint      `json:"id" gorm:"primaryKey"`
+	Name      string    `json:"name" gorm:"unique;not null"`
+	Color     string    `json:"color" gorm:"default:'#1890ff'"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+type EntityTag struct {
+	ID         uint       `json:"id" gorm:"primaryKey"`
+	EntityType EntityType `json:"entity_type" gorm:"type:varchar(50)"`
+	EntityID   uint       `json:"entity_id"`
+	TagID      uint       `json:"tag_id"`
+	Tag        Tag        `json:"tag" gorm:"foreignKey:TagID"`
+	CreatedAt  time.Time  `json:"created_at"`
+}
+
+type TimeLog struct {
+	ID          uint      `json:"id" gorm:"primaryKey"`
+	TaskID      uint      `json:"task_id"`
+	UserID      uint      `json:"user_id"`
+	Hours       float64   `json:"hours"`
+	Description string    `json:"description"`
+	LogDate     time.Time `json:"log_date"`
+	Task        Task      `json:"task" gorm:"foreignKey:TaskID"`
+	User        User      `json:"user" gorm:"foreignKey:UserID"`
+	CreatedAt   time.Time `json:"created_at"`
+}
+
+func CreateComment(comment *Comment) error {
+	return DB.Create(comment).Error
+}
+
+func GetCommentsByEntity(entityType string, entityID uint) ([]Comment, error) {
+	var comments []Comment
+	err := DB.Where("entity_type = ? AND entity_id = ?", entityType, entityID).
+		Preload("User").
+		Order("created_at DESC").
+		Find(&comments).Error
+	return comments, err
+}
+
+func UpdateComment(comment *Comment) error {
+	return DB.Save(comment).Error
+}
+
+func DeleteComment(id uint) error {
+	return DB.Delete(&Comment{}, id).Error
+}
+
+func CreateTag(tag *Tag) error {
+	return DB.Create(tag).Error
+}
+
+func GetAllTags() ([]Tag, error) {
+	var tags []Tag
+	err := DB.Find(&tags).Error
+	return tags, err
+}
+
+func GetTagByName(name string) (*Tag, error) {
+	var tag Tag
+	err := DB.Where("name = ?", name).First(&tag).Error
+	return &tag, err
+}
+
+func UpdateTag(tag *Tag) error {
+	return DB.Save(tag).Error
+}
+
+func DeleteTag(id uint) error {
+	return DB.Delete(&Tag{}, id).Error
+}
+
+func AddTagToEntity(entityType EntityType, entityID, tagID uint) error {
+	entityTag := EntityTag{
+		EntityType: entityType,
+		EntityID:   entityID,
+		TagID:      tagID,
+	}
+	return DB.Create(&entityTag).Error
+}
+
+func RemoveTagFromEntity(entityType EntityType, entityID, tagID uint) error {
+	return DB.Where("entity_type = ? AND entity_id = ? AND tag_id = ?", 
+		entityType, entityID, tagID).Delete(&EntityTag{}).Error
+}
+
+func GetTagsByEntity(entityType EntityType, entityID uint) ([]Tag, error) {
+	var tags []Tag
+	err := DB.Joins("JOIN entity_tags ON tags.id = entity_tags.tag_id").
+		Where("entity_tags.entity_type = ? AND entity_tags.entity_id = ?", 
+			entityType, entityID).
+		Find(&tags).Error
+	return tags, err
+}
+
+func CreateTimeLog(timeLog *TimeLog) error {
+	return DB.Create(timeLog).Error
+}
+
+func GetTimeLogsByTask(taskID uint) ([]TimeLog, error) {
+	var timeLogs []TimeLog
+	err := DB.Where("task_id = ?", taskID).
+		Preload("User").
+		Order("log_date DESC").
+		Find(&timeLogs).Error
+	return timeLogs, err
+}
+
+func GetTimeLogsByUser(userID uint, startDate, endDate time.Time) ([]TimeLog, error) {
+	var timeLogs []TimeLog
+	err := DB.Where("user_id = ? AND log_date BETWEEN ? AND ?", 
+		userID, startDate, endDate).
+		Preload("Task.Project").
+		Order("log_date DESC").
+		Find(&timeLogs).Error
+	return timeLogs, err
+}
+
+func UpdateTimeLog(timeLog *TimeLog) error {
+	return DB.Save(timeLog).Error
+}
+
+func DeleteTimeLog(id uint) error {
+	return DB.Delete(&TimeLog{}, id).Error
+}