Polygon-Schließen per Button + M2M-Setup-Route entfernt

- Polygon kann nun mit ≥2 Punkten über den Button geschlossen werden
- Button zeigt "Polygon schließen & hinzufügen" solange Polygon offen ist
- Automatisches Schließen (Verbindung zum Startpunkt) beim Klick
- Einmalige Setup-Route /api/directus/setup-m2m entfernt (nicht mehr benötigt)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -99,67 +99,6 @@ def directus_object(obj_id):
     return jsonify(data), status
 
 
-@app.route("/api/directus/setup-m2m", methods=["POST"])
-def directus_setup_m2m():
-    """Einmalig: m2m-Relationen für categories und questions auf objects anlegen."""
-    token = request.headers.get("Authorization", "")
-    results = []
-
-    for rel_name, related_table, related_fk in [
-        ("categories", "categories", "categories_id"),
-        ("questions",  "questions",  "questions_id"),
-    ]:
-        junction = f"objects_{rel_name}"
-
-        # 1. Altes m2o-Feld entfernen
-        d, s = _directus("DELETE", f"/fields/objects/{rel_name}", token)
-        results.append({"step": f"delete_m2o_{rel_name}", "status": s})
-
-        # 2. Junction-Collection anlegen
-        d, s = _directus("POST", "/collections", token, {
-            "collection": junction,
-            "meta": {"hidden": True, "icon": "import_export"},
-            "schema": {},
-        })
-        results.append({"step": f"create_junction_{junction}", "status": s})
-
-        # 3. Felder der Junction
-        for field_def in [
-            {"field": "id",        "type": "integer", "schema": {"has_auto_increment": True, "is_primary_key": True, "is_nullable": False}, "meta": {"hidden": True}},
-            {"field": "objects_id","type": "uuid",    "schema": {"foreign_key_table": "objects",      "foreign_key_column": "id", "is_nullable": False}, "meta": {"hidden": True}},
-            {"field": related_fk,  "type": "uuid",    "schema": {"foreign_key_table": related_table, "foreign_key_column": "id", "is_nullable": False}, "meta": {"hidden": True}},
-        ]:
-            d, s = _directus("POST", f"/fields/{junction}", token, field_def)
-            results.append({"step": f"field_{junction}_{field_def['field']}", "status": s})
-
-        # 4. Relation junction.objects_id → objects (mit back-reference)
-        d, s = _directus("POST", "/relations", token, {
-            "collection": junction, "field": "objects_id",
-            "related_collection": "objects",
-            "meta": {"one_field": rel_name, "junction_field": related_fk, "sort_field": None},
-            "schema": {"on_delete": "CASCADE"},
-        })
-        results.append({"step": f"relation_{junction}_objects", "status": s})
-
-        # 5. Relation junction.related_fk → related_table
-        d, s = _directus("POST", "/relations", token, {
-            "collection": junction, "field": related_fk,
-            "related_collection": related_table,
-            "schema": {"on_delete": "CASCADE"},
-        })
-        results.append({"step": f"relation_{junction}_{rel_name}", "status": s})
-
-        # 6. Alias-Feld auf objects (m2m)
-        d, s = _directus("POST", "/fields/objects", token, {
-            "field": rel_name, "type": "alias",
-            "meta": {"interface": "list-m2m", "special": ["m2m"], "hidden": False, "width": "full"},
-            "schema": None,
-        })
-        results.append({"step": f"alias_{rel_name}", "status": s})
-
-    return jsonify({"results": results})
-
-
 @app.route("/api/images", methods=["GET"])
 def list_images():
     """