feat(ui): stock card with withdraw and inventory count, production batches

- Bottling detail shows Abgefüllt / Webshop verkauft / Entnommen / Rest
  (negative rest flagged "Prüfen") and the full movement list; buttons
  "Entnehmen" (reason, note) and "Inventur korrigieren" (counted
  quantity, difference booked).
- Rest column in the bottling list.
- New pages for production batches (list, create, detail with the same
  stock card), sidebar entry with its own permission.
- Products get "Art" (honey vs. manufactured goods) and the webshop
  category; bottlings only offer honey articles.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Frontend/src/app/(app)/sidebar.tsx

@@ -8,6 +8,7 @@ import {
   Crown,
   Database,
   Droplet,
+  Factory,
   FileClock,
   FlaskConical,
   Hexagon,
@@ -81,6 +82,12 @@ const NAV_GROUPS: NavGroup[] = [
       { label: "Schleuderungen", href: "/extractions", icon: FlaskConical },
       { label: "Honigchargen", href: "/honey-batches", icon: Droplet },
       { label: "Abfüllungen", href: "/bottling", icon: Package },
+      {
+        label: "Herstellungschargen",
+        href: "/production-batches",
+        icon: Factory,
+        permission: "production-batch:read",
+      },
       { label: "Produkte", href: "/products", icon: ShoppingBag },
       { label: "Lager", href: "/storage", icon: Warehouse },
       { label: "Inventar", href: "/equipment", icon: Wrench },