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

Dockerfile

@@ -0,0 +1,40 @@
+# 构建阶段
+FROM golang:1.22-alpine AS builder
+
+# 安装构建依赖
+RUN apk add --no-cache git gcc g++ make opencv-dev onnxruntime-dev
+
+WORKDIR /app
+
+# 复制 Go 模块文件
+COPY go.mod go.sum ./
+RUN go mod download
+
+# 复制源代码
+COPY . .
+
+# 构建
+RUN CGO_ENABLED=1 go build -o anticaptcha ./cmd/server
+
+# 运行阶段
+FROM alpine:3.20
+
+# 安装运行时依赖
+RUN apk add --no-cache ca-certificates tzdata opencv onnxruntime
+
+WORKDIR /app
+
+# 复制二进制文件
+COPY --from=builder /app/anticaptcha .
+COPY --from=builder /app/models ./models
+COPY --from=builder /app/web/dist ./web/dist
+
+# 创建数据目录
+RUN mkdir -p /app/data
+
+ENV GIN_MODE=release
+ENV TZ=Asia/Shanghai
+
+EXPOSE 6688
+
+CMD ["./anticaptcha"]