i18n DE/EN + DossierSettings panel + English file renames

i18n:
- src/i18n/de.json + en.json: 200+ keys covering all main panels
- src/i18n/index.js: t(key, vars) reads window.DOSSIER_LANG
- panel_base.py: injects window.DOSSIER_LANG from dossier_settings.json
- EbenenManager, GeschossManager, AusschnitteApp, LayoutsApp: all
  context menus and main labels use t()

DossierSettings panel:
- DossierSettingsApp.jsx: language toggle (DE/EN pill) + launcher status
- toolbar.py: OPEN_SETTINGS opens new Rhino-hosted satellite window,
  SAVE_LANG writes lang to dossier_settings.json + reloads all panels

File renames (JSX → English):
- ZeichnungsebenenApp → DrawingLevelsApp
- GeschossManager/Dialog/Settings → Floor*
- AusschnitteApp/Settings → Viewports*
- EbenenManager/Settings → Layer*
- GestaltungApp → StylesApp, OberleisteApp → ToolbarApp
- WerkzeugeApp → ToolsApp, DimensionenApp → DimensionsApp
- MassstabApp → ScaleApp, KameraApp → CameraApp
- MasseSettingsApp → UnitsSettingsApp
- ConfirmDeleteEbene → ConfirmDeleteLayer
- AusschnittLayerDialog → ViewportLayerDialog

Python module renames:
- rhinopanel.py → layers_panel.py
- oberleiste.py → toolbar.py
- gestaltung.py → styles.py
- werkzeuge.py → tools.py
- dimensionen.py → dimensions.py
- startup.py _MODULE_TO_PY updated, all cross-imports fixed

rhino/tools.py

@@ -0,0 +1,60 @@
+#! python 3
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# Copyright (C) 2026 Karim Gabriele Varano
+"""
+werkzeuge.py
+WERKZEUGE-Panel: Architektur-orientierte Toolbar als React-WebView.
+Feuert Rhino-Befehle via RunScript bei Button-Klick.
+"""
+import os
+import sys
+import Rhino
+import scriptcontext as sc
+
+_HERE = os.path.dirname(os.path.abspath(__file__))
+if _HERE not in sys.path:
+    sys.path.insert(0, _HERE)
+
+import panel_base
+
+PANEL_GUID_STR = "6d9f5040-7e1f-4f2b-c4d5-f6071829304a"
+
+
+class WerkzeugeBridge(panel_base.BaseBridge):
+    def __init__(self):
+        panel_base.BaseBridge.__init__(self, "werkzeuge")
+
+    def _on_ready(self):
+        # Keine initialen Daten noetig — Toolbar ist statisch
+        pass
+
+    def handle(self, data):
+        if not isinstance(data, dict): return
+        t = data.get("type", "")
+        p = data.get("payload") or {}
+        if not isinstance(p, dict): p = {}
+        if t == "READY":
+            self._on_ready()
+        elif t == "RUN":
+            cmd = p.get("cmd")
+            if cmd and isinstance(cmd, str):
+                # Whitelist: alles muss mit "_" beginnen (Rhino-Befehl) und
+                # darf keine Zeilenumbrueche oder Semikolons enthalten.
+                cmd = cmd.strip()
+                if cmd.startswith("_") and "\n" not in cmd and ";" not in cmd:
+                    try:
+                        Rhino.RhinoApp.RunScript(cmd, False)
+                        print("[WERKZEUGE] {}".format(cmd))
+                    except Exception as ex:
+                        print("[WERKZEUGE] RunScript-Fehler:", ex)
+                else:
+                    print("[WERKZEUGE] Befehl ignoriert (kein '_' Praefix oder unsicher):", cmd)
+
+
+def _bridge_factory():
+    return WerkzeugeBridge()
+
+
+panel_base.register_and_open("werkzeuge", "Werkzeuge", PANEL_GUID_STR, _bridge_factory,
+                             icon_spec=("build", "#3a6fa8"))