feat: 新增52号发际线接口并限制GPU worker来源IP

保留5号历史三档实现，新增中下庭高度定位、扶正裁切、矩形叠加与30案例对比页。

worker仅允许本机和配置白名单访问；网关不增加IP限制。空图片URL字段改写限定为52号，保持旧接口兼容。同步接口、裁切与部署文档。

验证：113项测试通过；1项历史数值基线失败，在未修改的a3fddbb版本复现。浏览器验证5/52及30案例对比页通过。

hairline/face_landmarks.py

@@ -44,18 +44,18 @@ class FaceLandmarker:
         self._detector = vision.FaceLandmarker.create_from_options(options)
         self._mp = mp
 
-    def detect(self, image_rgb: np.ndarray) -> np.ndarray | None:
-        """Returns (468, 3) float32 of normalized x, y and relative z, or None.
+    def detect(self, image_rgb: np.ndarray, include_iris: bool = False) -> np.ndarray | None:
+        """Returns (468, 3), or (478, 3) with iris, normalized float32 points.
 
-        The task model produces 478 landmarks (468 face + 10 iris); we return
-        only the first 468 to match the canonical FaceMesh topology used by
-        the SDK's OBJ file.
+        The task model produces 478 landmarks (468 face + 10 iris). By default
+        only the first 468 match the SDK's canonical FaceMesh topology;
+        include_iris=True retains all 478 for face-measurement calibration.
         """
         mp_image = self._mp.Image(image_format=self._mp.ImageFormat.SRGB, data=image_rgb)
         result = self._detector.detect(mp_image)
         if not result.face_landmarks:
             return None
-        lm = result.face_landmarks[0][:468]
+        lm = result.face_landmarks[0] if include_iris else result.face_landmarks[0][:468]
         arr = np.array([[p.x, p.y, p.z] for p in lm], dtype=np.float32)
         return arr