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_p300.py

@@ -0,0 +1,45 @@
+"""P300 and P306 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)
+    power_strip = await client.p300(ip_address)
+
+    device_info = await power_strip.get_device_info()
+    print(f"Device info: {device_info.to_dict()}")
+
+    print("Getting child devices...")
+    child_device_list = await power_strip.get_child_device_list()
+    print(f"Found {len(child_device_list)} plugs")
+
+    for index, child in enumerate(child_device_list):
+        print(f"=== ({index + 1}) {child.nickname} ===")
+        print(f"Device ID: {child.device_id}")
+        print(f"State: {child.device_on}")
+
+        plug = await power_strip.plug(device_id=child.device_id)
+
+        print("Turning device on...")
+        await plug.on()
+
+        print("Waiting 2 seconds...")
+        await asyncio.sleep(2)
+
+        print("Turning device off...")
+        await plug.off()
+
+        print("Waiting 2 seconds...")
+        await asyncio.sleep(2)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())