rippy-ui-modern: API UI Modernisiert & Import-Fixes

- Doppelte Arcane-Einträge behoben (rippy statt Rippy) - Import-Fixes: relative → absolute imports in main.py, cache/__init__.py, prescan/__init__.py, clients/__init__.py - Neue Dateien: cache.py, prescan.py, Settings.tsx - API-Port 8000 in docker-compose.yml gemappt - UI mit Sidebar, Dark Mode, Einstellungen-Tabs

Fixes: #2978 (doppelte Einträge), #2888 (Import-Fehler)

docker/api/cache/cache.py

@@ -0,0 +1,42 @@
+"""Cache module."""
+
+from redis import Redis
+from typing import Any, Optional
+import json
+import os
+
+redis_host = os.getenv("REDIS_HOST", "redis")
+redis_port = int(os.getenv("REDIS_PORT", "6379"))
+
+redis_client = Redis(host=redis_host, port=redis_port, decode_responses=True)
+
+
+def init_cache() -> None:
+    """Initialize cache connection."""
+    pass
+
+
+def get(key: str) -> Optional[Any]:
+    """Get value from cache."""
+    value = redis_client.get(key)
+    if value:
+        return json.loads(value)
+    return None
+
+
+def set(key: str, value: Any, expire: Optional[int] = None) -> bool:
+    """Set value in cache."""
+    serialized = json.dumps(value)
+    if expire:
+        return redis_client.setex(key, expire, serialized)
+    return redis_client.set(key, serialized)
+
+
+def delete(key: str) -> bool:
+    """Delete value from cache."""
+    return redis_client.delete(key)
+
+
+def clear() -> bool:
+    """Clear all cache."""
+    return redis_client.flushdb()