model: TroCandidate statt OpenPoint, tro_overrides nutzt model-Klassen (Schema v3)

- OpenPoint -> model.TroCandidate (type, position, belongsTo, note);
  TroDocument.candidates ersetzt openPoints, Schema sps_skel-tro-v3
- Positionsbehandlung von TroBase und TroCandidate im Mixin _Positioned
- tro_overrides.py: eigene ConnectionSpec/OpenPoint entfallen, stattdessen
  model.Connection / model.TroCandidate; einheitliche Feldnamen
  (tro_id/separator, hosts als Liste)
- Fixtures, Beispiel-JSON und Doku auf v3 nachgezogen

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/material_flow.py

@@ -2349,7 +2349,7 @@ def render_connect_ini(graph: Graph, section: str = "Anlage", overrides=None) ->
     add("")
 
     if overrides is not None and (overrides.tros or overrides.splits
-                                  or overrides.open_points):
+                                  or overrides.candidates):
         add(f"[{section}.manual]")
         add("; Vor Ort bestaetigt, im CSV-Export nicht enthalten.")
         add(f"; Quelle: {overrides.source}")
@@ -2358,16 +2358,16 @@ def render_connect_ini(graph: Graph, section: str = "Anlage", overrides=None) ->
         for section_key, override in sorted(overrides.tros.items()):
             if not override.type_name:
                 continue
-            wie = f"Separator {override.key}" if override.by_separator else override.key
+            wie = f"Separator {override.separator}" if override.separator else override.tro_id
             add(f"{section_key} = {override.type_name} | {wie} | {override.reason}")
         for spec in overrides.splits:
             add(f"{spec.name} = NEU {spec.type_name} "
                 f"| Separator {', '.join(spec.separators)}"
                 + (f" + Scanner {', '.join(spec.scanners)}" if spec.scanners else "")
-                + (f" | Bahn {spec.host}" if spec.host else "")
+                + (f" | Bahn {', '.join(spec.hosts)}" if spec.hosts else "")
                 + f" | {spec.reason}")
-        for point in overrides.open_points:
-            add(f"{point.name} = OFFEN {point.expect or '?'} "
+        for point in overrides.candidates:
+            add(f"{point.name} = OFFEN {point.type_name or '?'} "
                 f"| x={point.x:.2f} y={point.y:.2f} "
                 f"| heute Teil von {point.belongs_to or '-'} "
                 f"| {point.note}")