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

socktest.py

@@ -0,0 +1,14 @@
+import os, socket
+p = "/tmp/test.sock"
+if os.path.exists(p):
+    os.remove(p)
+srv = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+try:
+    srv.bind(p)
+    srv.listen(1)
+    print("bound, listening")
+    print("exists immediately after bind:", os.path.exists(p))
+finally:
+    srv.close()
+    if os.path.exists(p):
+        os.remove(p)