Add slide and rotate interactive captcha solvers

New solver subsystem with independent models:
- GapDetectorCNN (1x128x256 grayscale → sigmoid) for slide gap detection
- RotationRegressor (3x128x128 RGB → sin/cos via tanh) for rotation angle prediction
- SlideSolver with 3-tier strategy: template match → edge detect → CNN fallback
- RotateSolver with ONNX sin/cos → atan2 inference
- Generators, training scripts, CLI commands, and slide track utility

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

solvers/base.py

@@ -0,0 +1,21 @@
+"""
+求解器基类
+"""
+
+from PIL import Image
+
+
+class BaseSolver:
+    """验证码求解器基类。"""
+
+    def solve(self, image: Image.Image, **kwargs) -> dict:
+        """
+        求解验证码。
+
+        Args:
+            image: 输入图片
+
+        Returns:
+            包含求解结果的字典
+        """
+        raise NotImplementedError