Initial commit: epaper-dashboard for 7.3" ACeP 7-Color display

- dashboard.py: plugin-based renderer with 4x4 grid layout
- admin.py: web UI with layout editor + plugin configs
- layout.py: pack algorithm, item placement, grid system
- plugins/: clock, weather, system, spotify, strava, gmail, minimax, hello
- network_watchdog.py: WiFi AP/client mode management
- waveshare_epd_init.py: vendor driver stub

test_sizes.py

@@ -0,0 +1,49 @@
+"""Test: clock als 4x1-Strip (200x120), minimax als 2x2, weather als 2x2 (lower-right).
+Zeigt ob Widgets auf verschiedene Groessen reagieren."""
+import sys; sys.path.insert(0, ".")
+from PIL import Image, ImageDraw, ImageFont
+from layout import Item, GRID_COLS, GRID_ROWS, CELL_W, CELL_H, pack
+from plugins.clock import Widget as ClockW
+from plugins.minimax import Widget as MiniMaxW
+from plugins.weather import Widget as WeatherW
+from plugins.hello import Widget as HelloW
+
+# Force-load fonts
+def font(size):
+    return ImageFont.truetype("fnt/Aldrich-Regular.ttc", size)
+fonts = {
+    "16": font(16), "20": font(20), "24": font(24),
+    "28": font(28), "32": font(32), "48": font(48),
+    "60": font(60), "80": font(80),
+    "clock": ImageFont.truetype("fnt/advanced_led_board-7.ttc", 100),
+}
+
+# Layout:
+#  clock (4x1)         | y=0
+#  minimax (2x1) hello (2x1) | y=1
+#  weather (4x2)       | y=2..3
+items = [
+    Item("a", "clock",    0, 0, 4, 1),
+    Item("b", "clock",    0, 0, 1, 1),  # tiny
+    Item("c", "clock",    0, 0, 2, 2),  # large
+    Item("d", "clock",    0, 0, 4, 4),  # full
+]
+
+print("Testing CLOCK widget at different sizes:")
+print("="*60)
+img = Image.new("RGB", (800, 480), (255,255,255))
+draw = ImageDraw.Draw(img)
+# 4x1 strip top
+w = ClockW({})
+w.fetch()
+w.render(draw, fonts, 0, 0, 800, 120)
+# 2x2 below
+w = ClockW({"show_date": True})
+w.fetch()
+w.render(draw, fonts, 0, 120, 400, 240)
+# mini 1x1 bottom-right
+w = ClockW({})
+w.fetch()
+w.render(draw, fonts, 600, 360, 200, 120)
+img.save("/tmp/sizes_clock.png")
+print("saved /tmp/sizes_clock.png")