Add a Microdot AP example and mpremote instructions for device tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

test/ap_microdot.py

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+"""Soft-AP + a tiny Microdot app.
+
+Requires lib/microdot on the board (see test/README.md).
+Connect to SSID AP_SSID, then open http://192.168.4.1/
+"""
+import network
+from microdot import Microdot
+
+AP_SSID = "led-test"
+AP_PASSWORD = ""  # empty = open network
+AP_HOST = "0.0.0.0"
+AP_PORT = 80
+
+
+def start_ap(ssid, password):
+    ap_if = network.WLAN(network.AP_IF)
+    ap_if.active(True)
+    if password:
+        ap_if.config(essid=ssid, password=password)
+    else:
+        ap_if.config(essid=ssid, authmode=network.AUTH_OPEN)
+    # Toggle like src/wifi.py so the AP actually comes up on ESP32.
+    ap_if.active(False)
+    ap_if.active(True)
+    ip, netmask, gateway, dns = ap_if.ifconfig()
+    print("AP ssid=%s ip=%s" % (ssid, ip))
+    return ap_if, ip
+
+
+app = Microdot()
+
+
+@app.route("/")
+async def index(request):
+    return "hello from microdot\n", 200, {"Content-Type": "text/plain"}
+
+
+@app.route("/ping")
+async def ping(request):
+    return {"ok": True}
+
+
+if __name__ == "__main__":
+    _, ip = start_ap(AP_SSID, AP_PASSWORD)
+    print("listening on http://%s:%d/" % (ip, AP_PORT))
+    app.run(host=AP_HOST, port=AP_PORT, debug=True)