refactor: refactor for modern layout

- split frontend and backend.
- update backend with modern Python dev strategies.

tools/dial_plate_gen.py

@@ -1,29 +0,0 @@
-import math
-
-print('Dial Plate Generator')
-plateSize = float(input('Plate size: '))
-hourInnerRadius = float(input('Hour inner radius percent (float): '))
-hourOutterRadius = float(input('Hour outter radius percent (float): '))
-minuteRadius = float(input('Minute radius percent (float): '))
-
-halfPlateSize = plateSize / 2
-for i in range(24):
-    rad = math.radians(90 - i * 30)
-    x = math.cos(rad)
-    y = math.sin(rad)
-    radius = halfPlateSize * (hourOutterRadius if i < 12 else hourInnerRadius)
-    x = x * radius + halfPlateSize
-    y = (-y * radius) + halfPlateSize
-    print('<text x="{:.6f}" y="{:.6f}">{}</text>'.format(x, y, i))
-
-print('')
-
-for i in range(12):
-    rad = math.radians(90 - i * 30)
-    x = math.cos(rad)
-    y = math.sin(rad)
-    radius = minuteRadius * halfPlateSize
-    x = x * radius + halfPlateSize
-    y = (-y * radius) + halfPlateSize
-    print('<text x="{:.6f}" y="{:.6f}">{}</text>'.format(x, y, i * 5))
-