feat: initialize cold display guard

config/example.toml

@@ -0,0 +1,46 @@
+camera_id = "cold_display_cam_01"
+timezone = "Asia/Shanghai"
+
+[thresholds]
+max_dwell_seconds = 10800
+trash_confirmation_seconds = 120
+
+[layout]
+rows = 2
+cols = 4
+zone_ids = ["r1c1", "r1c2", "r1c3", "r1c4", "r2c1", "r2c2", "r2c3", "r2c4"]
+
+[[zones]]
+id = "r1c1"
+polygon = [[0.00, 0.00], [0.25, 0.00], [0.25, 0.50], [0.00, 0.50]]
+
+[[zones]]
+id = "r1c2"
+polygon = [[0.25, 0.00], [0.50, 0.00], [0.50, 0.50], [0.25, 0.50]]
+
+[[zones]]
+id = "r1c3"
+polygon = [[0.50, 0.00], [0.75, 0.00], [0.75, 0.50], [0.50, 0.50]]
+
+[[zones]]
+id = "r1c4"
+polygon = [[0.75, 0.00], [1.00, 0.00], [1.00, 0.50], [0.75, 0.50]]
+
+[[zones]]
+id = "r2c1"
+polygon = [[0.00, 0.50], [0.25, 0.50], [0.25, 1.00], [0.00, 1.00]]
+
+[[zones]]
+id = "r2c2"
+polygon = [[0.25, 0.50], [0.50, 0.50], [0.50, 1.00], [0.25, 1.00]]
+
+[[zones]]
+id = "r2c3"
+polygon = [[0.50, 0.50], [0.75, 0.50], [0.75, 1.00], [0.50, 1.00]]
+
+[[zones]]
+id = "r2c4"
+polygon = [[0.75, 0.50], [1.00, 0.50], [1.00, 1.00], [0.75, 1.00]]
+
+[trash]
+roi = [[0.80, 0.65], [1.00, 0.65], [1.00, 1.00], [0.80, 1.00]]