fix: 从 Gitea 仓库下载模型（无需认证）

internal/captcha/handler.go

@@ -17,14 +17,15 @@ type Handler struct {
 
 // 模型配置
 var modelConfigs = map[string]string{
-	"math.onnx":    "[AntiCAP]-CRNN_Math.onnx",
-	"ocr.onnx":     "[Dddd]-OCR.onnx",
-	"rotate.onnx":  "[AntiCAP]-Rotation-RotNetR.onnx",
-	"siamese.onnx": "[AntiCAP]-Siamese-ResNet18.onnx",
-	"charsets.txt": "[Dddd]-CharSets.txt",
+	"math.onnx":    "math.onnx",
+	"ocr.onnx":     "ocr.onnx",
+	"rotate.onnx":  "rotate.onnx",
+	"siamese.onnx": "siamese.onnx",
+	"charsets.txt": "charsets.txt",
 }
 
-const modelBaseURL = "https://raw.githubusercontent.com/81NewArk/AntiCAP/main/AntiCAP/AntiCAP-Models"
+// 从 Gitea 仓库下载（无需认证，公开仓库）
+const modelBaseURL = "https://git.viaeon.com/admin/anticaptcha/raw/branch/main/models"
 
 func NewHandler(modelPath string) *Handler {
 	h := &Handler{