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

.gitignore

@@ -0,0 +1,41 @@
+# 忽略编译产物
+anticaptcha
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# 忽略数据目录
+data/
+*.db
+
+# 忽略日志
+*.log
+
+# 忽略 IDE 配置
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# 忽略依赖
+vendor/
+node_modules/
+
+# 忽略前端构建产物
+web/dist/
+web/node_modules/
+
+# 忽略环境配置
+.env
+.env.local
+*.local
+
+# 忽略密钥
+secret.key
+config.yaml
+
+# 忽略临时文件
+*.tmp
+*.temp