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/onnx/onnx.go

@@ -0,0 +1,118 @@
+package onnx
+
+/*
+#cgo CXXFLAGS: -std=c++17
+#cgo linux LDFLAGS: -lonnxruntime -ldl
+#cgo darwin LDFLAGS: -lonnxruntime -framework CoreFoundation
+
+#include <stdlib.h>
+#include <string.h>
+
+// ONNX Runtime C API 声明
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void* OrtSession;
+typedef void* OrtMemoryInfo;
+typedef void* OrtValue;
+
+// 初始化 ONNX 会话
+OrtSession onnx_create_session(const char* model_path);
+void onnx_destroy_session(OrtSession session);
+
+// 运行推理
+int onnx_run(OrtSession session, const float* input_data, int input_size, float* output_data, int output_size);
+
+// 错误信息
+const char* onnx_get_last_error();
+
+#ifdef __cplusplus
+}
+#endif
+*/
+import "C"
+import (
+	"errors"
+	"fmt"
+	"sync"
+	"unsafe"
+)
+
+type Session struct {
+	session C.OrtSession
+	mu      sync.Mutex
+}
+
+var (
+	sessions = make(map[string]*Session)
+	mu       sync.RWMutex
+)
+
+// LoadModel 加载 ONNX 模型
+func LoadModel(name, path string) error {
+	cPath := C.CString(path)
+	defer C.free(unsafe.Pointer(cPath))
+
+	session := C.onnx_create_session(cPath)
+	if session == nil {
+		return fmt.Errorf("加载模型失败: %s", C.GoString(C.onnx_get_last_error()))
+	}
+
+	mu.Lock()
+	sessions[name] = &Session{session: session}
+	mu.Unlock()
+
+	return nil
+}
+
+// Run 执行模型推理
+func (s *Session) Run(input []float32, inputSize int) ([]float32, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	output := make([]float32, inputSize)
+	
+	result := C.onnx_run(
+		s.session,
+		(*C.float)(unsafe.Pointer(&input[0])),
+		C.int(len(input)),
+		(*C.float)(unsafe.Pointer(&output[0])),
+		C.int(len(output)),
+	)
+
+	if result != 0 {
+		return nil, errors.New(C.GoString(C.onnx_get_last_error()))
+	}
+
+	return output, nil
+}
+
+// Close 关闭会话
+func (s *Session) Close() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	
+	if s.session != nil {
+		C.onnx_destroy_session(s.session)
+		s.session = nil
+	}
+}
+
+// GetSession 获取已加载的会话
+func GetSession(name string) (*Session, bool) {
+	mu.RLock()
+	s, ok := sessions[name]
+	mu.RUnlock()
+	return s, ok
+}
+
+// CloseAll 关闭所有会话
+func CloseAll() {
+	mu.Lock()
+	for _, s := range sessions {
+		s.Close()
+	}
+	sessions = make(map[string]*Session)
+	mu.Unlock()
+}