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_minimax_render.py

@@ -0,0 +1,26 @@
+import sys; sys.path.insert(0, ".")
+from PIL import Image, ImageDraw, ImageFont
+from plugins.minimax import Widget
+
+class FakeWidget(Widget):
+    def fetch(self):
+        return {
+            "windows": [
+                {"label": "5-Hour", "used_pct": 47.0, "remaining_pct": 53.0, "reset_seconds": 1820, "raw": {}},
+                {"label": "Weekly", "used_pct": 23.0, "remaining_pct": 77.0, "reset_seconds": 124800, "raw": {}},
+            ],
+            "credits": {"points": 12345.0},
+        }
+
+img = Image.new("RGB", (400, 240), (255, 255, 255))
+draw = ImageDraw.Draw(img)
+fonts = {
+    "16": ImageFont.truetype("fnt/Aldrich-Regular.ttc", 16),
+    "20": ImageFont.truetype("fnt/Aldrich-Regular.ttc", 20),
+    "24": ImageFont.truetype("fnt/Aldrich-Regular.ttc", 24),
+    "28": ImageFont.truetype("fnt/Aldrich-Regular.ttc", 28),
+}
+w = FakeWidget({"show_credits": True, "label_5h": "5-Hour", "label_weekly": "Weekly"})
+w.render(draw, fonts, 0, 0, 400, 240)
+img.save("/tmp/minimax_fake.png")
+print("saved /tmp/minimax_fake.png")