refactor backend packages and global db service

backend/internal/models/new.go

@@ -0,0 +1,39 @@
+package models
+
+import (
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+var DBService *gorm.DB
+
+func New(dsn string) error {
+	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
+	if err != nil {
+		return err
+	}
+
+	if err := AutoMigrate(db); err != nil {
+		return err
+	}
+
+	DBService = db
+	return nil
+}
+
+func AutoMigrate(database *gorm.DB) error {
+	return database.AutoMigrate(
+		&SenlinAgentUser{},
+		&SenlinAgentProject{},
+		&SenlinAgentInboxItem{},
+		&SenlinAgentTask{},
+		&SenlinAgentNote{},
+		&SenlinAgentSource{},
+		&SenlinAgentAISession{},
+		&SenlinAgentTag{},
+		&SenlinAgentProjectEvent{},
+		&SenlinAgentAIKey{},
+		&SenlinAgentAICallLog{},
+		&SenlinAgentTaskShare{},
+	)
+}