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/database.go

@@ -0,0 +1,60 @@
+package models
+
+import (
+	"fmt"
+	"time"
+
+	"giteapm/config"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+var DB *gorm.DB
+
+func InitDB(cfg config.DatabaseConfig) (*gorm.DB, error) {
+	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=%s&parseTime=True&loc=Local",
+		cfg.Username, cfg.Password, cfg.Host, cfg.Port, cfg.Database, cfg.Charset)
+
+	var err error
+	DB, err = gorm.Open(mysql.Open(dsn), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Info),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("连接数据库失败: %v", err)
+	}
+
+	sqlDB, err := DB.DB()
+	if err != nil {
+		return nil, fmt.Errorf("获取底层数据库连接失败: %v", err)
+	}
+
+	sqlDB.SetMaxIdleConns(10)
+	sqlDB.SetMaxOpenConns(100)
+	sqlDB.SetConnMaxLifetime(time.Hour)
+
+	if err := autoMigrate(); err != nil {
+		return nil, fmt.Errorf("数据库迁移失败: %v", err)
+	}
+
+	return DB, nil
+}
+
+func autoMigrate() error {
+	return DB.AutoMigrate(
+		&User{},
+		&Project{},
+		&ProjectMember{},
+		&Epic{},
+		&Story{},
+		&Task{},
+		&GiteaRelation{},
+		&Sprint{},
+		&Comment{},
+		&Tag{},
+		&EntityTag{},
+		&TimeLog{},
+		&WebhookConfig{},
+	)
+}