feat(tapo-agent): add schedule/countdown timer API support

- Fork tapo crate to add missing schedule/timer APIs
- Add get_countdown_rules, get_schedule_rules, get_next_event methods
- New readings: countdown_active, countdown_remain, schedule_count,
  schedule_active_count, next_event_time
- Add local compilation to build script alongside cross-compilation
- Implement offline polling - device collection continues when server disconnects
- Add more device readings: on_time, signal_level, rssi, runtime_today/month, energy_month

Vendored tapo fork in tapo-fork/ with minimal changes to add schedule APIs.

agents/tapo/tapo-fork/tapo-py/examples/tapo_l510.py

@@ -0,0 +1,40 @@
+"""L510, L520 and L610 Example"""
+
+import asyncio
+import os
+
+from tapo import ApiClient
+
+
+async def main():
+    tapo_username = os.getenv("TAPO_USERNAME")
+    tapo_password = os.getenv("TAPO_PASSWORD")
+    ip_address = os.getenv("IP_ADDRESS")
+
+    client = ApiClient(tapo_username, tapo_password)
+    device = await client.l510(ip_address)
+
+    print("Turning device on...")
+    await device.on()
+
+    print("Waiting 2 seconds...")
+    await asyncio.sleep(2)
+
+    print("Setting the brightness to 30%...")
+    await device.set_brightness(30)
+
+    print("Waiting 2 seconds...")
+    await asyncio.sleep(2)
+
+    print("Turning device off...")
+    await device.off()
+
+    device_info = await device.get_device_info()
+    print(f"Device info: {device_info.to_dict()}")
+
+    device_usage = await device.get_device_usage()
+    print(f"Device usage: {device_usage.to_dict()}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())