feat(ui): raw material lots and production inputs

- Pages for raw material lots (beeswax, propolis): list, create in grams
  with optional apiary, detail with stock card (harvested / used in
  production / withdrawn / remaining) and "used in" batches.
- Production batch form takes the raw material used (lot + grams) and the
  batch page shows what it was made from - traceability both ways.
- Sidebar entry "Rohstoffe".
- Removes backend files that were committed into ApiCore-Frontend/src by
  mistake in e52a605 (copies of ApiCore-Backend/src/raw-materials).

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

ApiCore-Frontend/src/lib/raw-materials/labels.spec.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+import { formatGrams } from "./labels";
+
+describe("formatGrams", () => {
+  it("shows kilograms from 1000 g on", () => {
+    expect(formatGrams(4200)).toBe("4,2 kg");
+    expect(formatGrams(1000)).toBe("1 kg");
+  });
+
+  it("keeps grams below a kilogram", () => {
+    expect(formatGrams(180)).toBe("180 g");
+  });
+});