feat: T4 waves 1-2 - rule configs, schema, suggestions core, season, rule forms

- Rule configs with typed parsers and registry; Berlin day helpers
- Schema: T4 enums, Suggestion table, feed vocabulary (feedStatus as
  ColonyCondition with legacy text mapping), split queen source,
  varroa sample size; migration harness for data migrations
- SuggestionsService: propose/refresh/resolve/obsolete/expire,
  accept/dismiss/reopen incl. bulk, lock order, concurrency e2e
- SeasonService: phenology-based segments, inspection/varroa due dates,
  queen age; TimeEventsStep with JobPartialFailure
- Frontend: per-rule settings forms with visible value sources

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

ApiCore-Backend/src/season/varroa-due.ts

@@ -0,0 +1,67 @@
+import { addDays } from '../common/dates';
+import type { SeasonAutopilotConfig } from '../automation/rule-config/rule-config.types';
+import type { SeasonState } from './season-types';
+
+export interface VarroaDue {
+  dueOn: string;
+  kind: 'INTERVAL' | 'WINTER_WINDOW';
+  /** Changes with every new measurement (or winter), so one due date stays one reminder. */
+  anchor: string;
+}
+
+/*
+ * Invariant: the winter window (SEASON_AUTOPILOT.winterVarroaWindow, default
+ * 11-15) lies inside WINTERRUHE, i.e. it does not begin before the WINTER
+ * date of PHENOLOGY.calendarFallback (default 11-15). Before WINTER the
+ * interval rule applies instead.
+ */
+
+/** A measurement from this day on counts for the winter window of the year. */
+const WINTER_MEASUREMENT_FROM = '11-01';
+
+/**
+ * The day a varroa measurement is due. Outside WINTERRUHE: the last
+ * measurement (else the creation of the colony) plus the interval. In
+ * WINTERRUHE only inside the winter window, once, if there was no
+ * measurement since 11-01.
+ */
+export function varroaMeasurementDue(
+  input: {
+    createdOn: string;
+    lastMeasuredOn: string | null;
+    lastMeasurementId: string | null;
+  },
+  season: Pick<SeasonState, 'segment' | 'springSince'>,
+  config: SeasonAutopilotConfig,
+  today: string,
+): VarroaDue | null {
+  if (season.segment !== 'WINTERRUHE') {
+    const base = input.lastMeasuredOn ?? input.createdOn;
+    const intervalDue = addDays(base, config.varroaMeasureIntervalDays);
+    // A due day that fell into the winter is taken up at the start of
+    // FRUEHJAHR, like the first inspection of the year.
+    const dueOn =
+      season.springSince !== null && intervalDue < season.springSince
+        ? season.springSince
+        : intervalDue;
+    return {
+      dueOn,
+      kind: 'INTERVAL',
+      anchor: input.lastMeasurementId ?? 'none',
+    };
+  }
+  const year = today.slice(0, 4);
+  const { from, to } = config.winterVarroaWindow;
+  const inWindow = today >= `${year}-${from}` && today <= `${year}-${to}`;
+  const measuredThisWinter =
+    input.lastMeasuredOn !== null &&
+    input.lastMeasuredOn >= `${year}-${WINTER_MEASUREMENT_FROM}`;
+  if (!inWindow || measuredThisWinter) {
+    return null;
+  }
+  return {
+    dueOn: `${year}-${from}`,
+    kind: 'WINTER_WINDOW',
+    anchor: `winter-${year}`,
+  };
+}