feat: initial commit - Go + CGO captcha recognition service

Features:
- Go + CGO ONNX/OpenCV wrapper for high performance
- SQLite (default) / MySQL database support
- Optional Redis caching
- JWT authentication system
- Multiple captcha recognition APIs:
  - OCR text recognition
  - Slider captcha matching
  - Image similarity comparison
  - Rotation captcha detection
  - Object detection
- React frontend with install wizard
- Docker and docker-compose support
- Gitea CI/CD pipeline

Project structure:
- cmd/server: Main entry point
- internal/: Core business logic
- pkg/onnx: ONNX Runtime CGO wrapper
- pkg/opencv: OpenCV CGO wrapper
- web/: React frontend
- deploy/: Deployment configs
- scripts/: Utility scripts

internal/model/models.go

@@ -0,0 +1,106 @@
+package model
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type UserRole string
+
+const (
+	RoleAdmin UserRole = "admin"
+	RoleUser  UserRole = "user"
+)
+
+type User struct {
+	ID            uint           `gorm:"primarykey" json:"id"`
+	Username      string         `gorm:"uniqueIndex;size:50;not null" json:"username"`
+	HashedPassword string        `gorm:"size:255;not null" json:"-"`
+	Role          UserRole       `gorm:"size:20;default:user" json:"role"`
+	Balance       int            `gorm:"default:1000" json:"balance"`
+	CreatedAt     time.Time      `json:"created_at"`
+	UpdatedAt     time.Time      `json:"updated_at"`
+	DeletedAt     gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+type RegistrationCode struct {
+	ID        uint      `gorm:"primarykey" json:"id"`
+	Code      string    `gorm:"uniqueIndex;size:100;not null" json:"code"`
+	IsUsed    bool      `gorm:"default:false" json:"is_used"`
+	Points    int       `gorm:"default:1000" json:"points"`
+	CreatedBy uint      `json:"created_by"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+type EndpointCost struct {
+	ID          uint   `gorm:"primarykey" json:"id"`
+	Path        string `gorm:"uniqueIndex;size:100;not null" json:"path"`
+	Cost        int    `gorm:"default:1" json:"cost"`
+	Description string `gorm:"size:255" json:"description"`
+}
+
+type Config struct {
+	ID        uint   `gorm:"primarykey" json:"id"`
+	Key       string `gorm:"uniqueIndex;size:100;not null" json:"key"`
+	Value     string `gorm:"type:text" json:"value"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+// 验证码请求模型
+
+type OCRRequest struct {
+	ImageBase64 string `json:"img_base64" binding:"required"`
+}
+
+type MathRequest struct {
+	ImageBase64 string `json:"img_base64" binding:"required"`
+}
+
+type SliderMatchRequest struct {
+	TargetBase64     string `json:"target_base64" binding:"required"`
+	BackgroundBase64 string `json:"background_base64" binding:"required"`
+}
+
+type RotateRequest struct {
+	ImageBase64 string `json:"img_base64" binding:"required"`
+}
+
+type DoubleRotateRequest struct {
+	InsideBase64  string `json:"inside_base64" binding:"required"`
+	OutsideBase64 string `json:"outside_base64" binding:"required"`
+}
+
+type DetectIconRequest struct {
+	ImageBase64 string `json:"img_base64" binding:"required"`
+}
+
+type DetectIconOrderRequest struct {
+	OrderImgBase64  string `json:"order_img_base64" binding:"required"`
+	TargetImgBase64 string `json:"target_img_base64" binding:"required"`
+}
+
+type CompareImageRequest struct {
+	Image1Base64 string `json:"img1_base64" binding:"required"`
+	Image2Base64 string `json:"img2_base64" binding:"required"`
+}
+
+// 响应模型
+
+type CaptchaResult struct {
+	Result interface{} `json:"result"`
+}
+
+type LoginResponse struct {
+	AccessToken string `json:"access_token"`
+	TokenType   string `json:"token_type"`
+	Role        string `json:"role"`
+	Balance     int    `json:"balance"`
+}
+
+type UserResponse struct {
+	ID       uint   `json:"id"`
+	Username string `json:"username"`
+	Role     string `json:"role"`
+	Balance  int    `json:"balance"`
+}