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

pkg/opencv/opencv.go

@@ -0,0 +1,146 @@
+package opencv
+
+/*
+#cgo CXXFLAGS: -std=c++17
+#cgo linux LDFLAGS: -lopencv_core -lopencv_imgproc -lopencv_imgcodecs -lopencv_objdetect
+#cgo darwin LDFLAGS: -lopencv_core -lopencv_imgproc -lopencv_imgcodecs -lopencv_objdetect
+
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// 图像结构
+typedef struct {
+    unsigned char* data;
+    int width;
+    int height;
+    int channels;
+} Image;
+
+// 图像操作
+Image* cv_imdecode(const unsigned char* buf, size_t size);
+void cv_image_free(Image* img);
+
+// 滑块匹配
+int cv_slider_match(const Image* target, const Image* background, int* out_x);
+int cv_slider_comparison(const Image* target, const Image* background, int* out_x);
+
+// 旋转检测
+float cv_detect_rotation(const Image* img);
+
+// 模板匹配
+int cv_template_match(const Image* src, const Image* templ, double* max_val, int* max_x, int* max_y);
+
+// 特征点检测
+int cv_detect_features(const Image* img, int** points_x, int** points_y, int* count);
+
+// 图像相似度
+float cv_compare_similarity(const Image* img1, const Image* img2);
+
+// 错误信息
+const char* cv_get_last_error();
+
+#ifdef __cplusplus
+}
+#endif
+*/
+import "C"
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"unsafe"
+)
+
+// Image 封装图像数据
+type Image struct {
+	img *C.Image
+}
+
+// DecodeFromBase64 从 Base64 解码图像
+func DecodeFromBase64(data string) (*Image, error) {
+	decoded, err := base64.StdEncoding.DecodeString(data)
+	if err != nil {
+		return nil, fmt.Errorf("base64 解码失败: %v", err)
+	}
+
+	img := C.cv_imdecode(
+		(*C.uchar)(unsafe.Pointer(&decoded[0])),
+		C.size_t(len(decoded)),
+	)
+
+	if img == nil {
+		return nil, errors.New(C.GoString(C.cv_get_last_error()))
+	}
+
+	return &Image{img: img}, nil
+}
+
+// Free 释放图像内存
+func (i *Image) Free() {
+	if i.img != nil {
+		C.cv_image_free(i.img)
+		i.img = nil
+	}
+}
+
+// Width 获取宽度
+func (i *Image) Width() int {
+	return int(i.img.width)
+}
+
+// Height 获取高度
+func (i *Image) Height() int {
+	return int(i.img.height)
+}
+
+// SliderMatch 滑块缺口匹配
+func SliderMatch(target, background *Image) (int, error) {
+	var outX C.int
+	
+	result := C.cv_slider_match(
+		(*C.Image)(target.img),
+		(*C.Image)(background.img),
+		&outX,
+	)
+
+	if result != 0 {
+		return 0, errors.New(C.GoString(C.cv_get_last_error()))
+	}
+
+	return int(outX), nil
+}
+
+// SliderComparison 阴影滑块匹配
+func SliderComparison(target, background *Image) (int, error) {
+	var outX C.int
+	
+	result := C.cv_slider_comparison(
+		(*C.Image)(target.img),
+		(*C.Image)(background.img),
+		&outX,
+	)
+
+	if result != 0 {
+		return 0, errors.New(C.GoString(C.cv_get_last_error()))
+	}
+
+	return int(outX), nil
+}
+
+// DetectRotation 检测旋转角度
+func DetectRotation(img *Image) (float32, error) {
+	angle := C.cv_detect_rotation((*C.Image)(img.img))
+	return float32(angle), nil
+}
+
+// CompareSimilarity 比较图像相似度
+func CompareSimilarity(img1, img2 *Image) (float32, error) {
+	similarity := C.cv_compare_similarity(
+		(*C.Image)(img1.img),
+		(*C.Image)(img2.img),
+	)
+	return float32(similarity), nil
+}