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

go.mod

@@ -0,0 +1,16 @@
+module anticaptcha
+
+go 1.22
+
+require (
+	github.com/gin-contrib/cors v1.7.2
+	github.com/gin-gonic/gin v1.7.7
+	github.com/golang-jwt/jwt/v5 v5.2.1
+	github.com/mattn/go-sqlite3 v1.14.22
+	github.com/pressly/goose/v3 v3.21.1
+	github.com/spf13/viper v1.19.0
+	golang.org/x/crypto v0.25.0
+	gorm.io/driver/mysql v1.5.7
+	gorm.io/driver/sqlite v1.5.6
+	gorm.io/gorm v1.25.11
+)