Add SPEC, PLAN, Dockerfile, compose, env example, app modules, CI workflow

app/state.py

@@ -0,0 +1,25 @@
+import json
+import logging
+import os
+
+log = logging.getLogger("state")
+
+
+def load(state_path: str):
+    if not os.path.exists(state_path):
+        log.info("Keine vorherige State-Datei gefunden (%s) - Erstlauf.", state_path)
+        return None
+    try:
+        with open(state_path, "r") as f:
+            data = json.load(f)
+        return data.get("last_ip")
+    except (json.JSONDecodeError, OSError) as exc:
+        log.warning("State-Datei konnte nicht gelesen werden (%s): %s", state_path, exc)
+        return None
+
+
+def save(state_path: str, ip: str):
+    os.makedirs(os.path.dirname(state_path), exist_ok=True)
+    with open(state_path, "w") as f:
+        json.dump({"last_ip": ip}, f)
+    log.info("State gespeichert: last_ip=%s", ip)