Add new daemons and debug scripts for Sigenergy and Oracle functionalities

- Implement `sigen_daemon.py` to poll Sigenergy plant metrics and store snapshots.
- Create `web_daemon.py` for serving a web interface with various endpoints.
- Add debug scripts:
  - `debug_duplicates.py` to find duplicate target times in forecast data.
  - `debug_energy_forecast.py` to print baseline energy forecast curves.
  - `debug_oracle_evaluations.py` to run the oracle evaluator.
  - `debug_sigen.py` to inspect stored Sigenergy plant snapshots.
  - `debug_weather.py` to trace resolved truth data.
  - `modbus_test.py` for exploring Sigenergy plants or inverters over Modbus TCP.
- Introduce `oracle_evaluator.py` for evaluating stored oracle predictions against actuals.
- Add TCN training scripts in `tcn` directory for training usage sequence models.

gibil/scripts/debug/debug_duplicates.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+"""Debug script to find duplicate target times in forecast data."""
+
+from gibil.classes.env_loader import EnvLoader
+from gibil.classes.weather.store import WeatherStore
+from collections import defaultdict
+
+EnvLoader().load()
+
+store = WeatherStore.from_env()
+dataset = store.load_display_dataset()
+
+# Group by (target_at, horizon_hours) to find duplicates
+by_key = defaultdict(list)
+for point in dataset.forecast_points:
+    key = (point.target_at, point.horizon_hours)
+    by_key[key].append(point)
+
+# Find duplicates
+duplicates = {k: v for k, v in by_key.items() if len(v) > 1}
+
+print(f"\nTotal forecast points: {len(dataset.forecast_points)}")
+print(f"Unique (target_at, horizon) pairs: {len(by_key)}")
+print(f"Duplicate (target_at, horizon) pairs: {len(duplicates)}")
+
+if duplicates:
+    print("\nFirst 3 duplicates:")
+    for (target_at, horizon), points in list(duplicates.items())[:3]:
+        print(f"\n  target_at={target_at}, horizon={horizon}h ({len(points)} points):")
+        for i, p in enumerate(points):
+            print(f"    [{i}] issued_at={p.issued_at}, temp={p.temperature_c}, source={p.source}")