Refactor WeChat integration to support multiple mini programs, removing hardcoded WeChat credentials and updating user model and authentication flow accordingly.

internal/model/mini_program.go

@@ -0,0 +1,23 @@
+package model
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type MiniProgram struct {
+	ID        uint           `gorm:"primarykey" json:"id"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+
+	Name        string `gorm:"size:100;not null" json:"name"`
+	AppID       string `gorm:"size:100;uniqueIndex" json:"app_id"`
+	AppSecret   string `gorm:"size:200;not null" json:"-"`
+	Description string `gorm:"size:255" json:"description"`
+}
+
+func (MiniProgram) TableName() string {
+	return "mini_programs"
+}