feat(frontend): Varroamessungen-Modul (Modul 7)

Mobile-optimiertes Erfassungsformular unter /varroa/new sowie
"Varroa"-Ansicht mit Verlaufsgrafik auf der Volk-Detailseite.

ApiCore-Frontend/src/lib/varroa/api.ts

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+import { apiFetch } from "@/lib/auth/api-client";
+import { CreateVarroaMeasurementInput, VarroaMeasurement } from "./types";
+
+export function fetchColonyVarroaMeasurements(colonyId: string): Promise<VarroaMeasurement[]> {
+  return apiFetch<VarroaMeasurement[]>(`/colonies/${colonyId}/varroa-measurements`);
+}
+
+export function createVarroaMeasurement(
+  input: CreateVarroaMeasurementInput,
+): Promise<VarroaMeasurement> {
+  return apiFetch<VarroaMeasurement>("/varroa-measurements", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}

ApiCore-Frontend/src/lib/varroa/types.ts

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+export type VarroaMethod =
+  | "NATURAL_MITE_FALL"
+  | "POWDERED_SUGAR"
+  | "WASHING_METHOD"
+  | "DRONE_BROOD_CONTROL";
+
+export interface VarroaMeasurement {
+  id: string;
+  colonyId: string;
+  userId: string;
+  date: string;
+  method: VarroaMethod;
+  durationMinutes: number | null;
+  miteCount: number | null;
+  calculatedValue: number | null;
+  assessment: string | null;
+  notes: string | null;
+  createdAt: string;
+}
+
+export interface CreateVarroaMeasurementInput {
+  colonyId: string;
+  date: string;
+  method: VarroaMethod;
+  durationMinutes?: number;
+  miteCount?: number;
+  calculatedValue?: number;
+  assessment?: string;
+  notes?: string;
+}