feat: Reminder Manager + Schattenmarkt-Freigabe + mock data overhaul

- Add Reminder Manager page (/supply/reminder-manager) with KPI bar,
  filter bar, list/card feed, and detail drawer (7 sections incl.
  activity log, snooze, complete, dismiss actions)
- Add Schattenmarkt-Freigabe toggle on PropertyDetailView: Verwaltung
  can opt-in properties for early market exposure before contract expiry
- Auto-generate FutureSignal cards via useSchattenmarktSignals hook
  when leaseEndDate - leadTimeMonths <= MOCK_TODAY
- Fix useUnifiedResults: use property.resultType as fallback (was
  defaulting everything to VERIFIED_PORTFOLIO)
- Fix demand Results: hide VERIFIED_PORTFOLIO from non-manager users
  even when showOwnProperties toggle was previously enabled
- Fix AppShell: redirect to allowed workspace on user role switch
- Fix 3 wrong match scores (match-002: 93→62, match-009: 86→55,
  match-017: 87→52)
- Add 7 new match records (match-050–056) for need-001, need-002,
  need-011
- Add need-011 (Retail Bern Innenstadt)
- Add prop-031–036 (EXTERNAL_MARKET / MAISON_WORK / FUTURE_AVAILABILITY)
- Fix duplicate image URLs across all properties
- Add signal-011 (Bern Altstadt, Mode Boutique) + propertyId to
  signal-001

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/services/reminderService.ts

@@ -0,0 +1,66 @@
+import { MockupReminderProvider } from '../provider/MockupReminderProvider'
+import type { Reminder } from '../domain/reminder'
+import { ReminderPriority, ReminderStatus, ShadowMarketRisk } from '../domain/reminder'
+
+const provider = MockupReminderProvider
+
+const MOCK_TODAY = new Date('2026-05-20')
+
+function daysDiff(isoDate: string): number {
+  const due = new Date(isoDate)
+  return Math.ceil((due.getTime() - MOCK_TODAY.getTime()) / (1000 * 60 * 60 * 24))
+}
+
+export const reminderService = {
+  getAll: () => provider.getAll(),
+  getById: (id: string) => provider.getById(id),
+  update: (id: string, data: Partial<Reminder>) => provider.update(id, data),
+  complete: (id: string, note?: string) => provider.complete(id, note),
+  dismiss: (id: string, note?: string) => provider.dismiss(id, note),
+  snooze: (id: string, until: string) => provider.snooze(id, until),
+  create: (data: Omit<Reminder, 'id' | 'activity' | 'createdAt' | 'updatedAt'>) =>
+    provider.create(data),
+
+  getInsights: async () => {
+    const reminders = await provider.getAll()
+    const active = reminders.filter(r => r.status === ReminderStatus.ACTIVE || r.status === ReminderStatus.SNOOZED)
+
+    const urgentCount = active.filter(r => r.priority === ReminderPriority.URGENT).length
+
+    const endOfWeek = new Date(MOCK_TODAY)
+    endOfWeek.setDate(endOfWeek.getDate() + 7)
+    const dueThisWeek = active.filter(r => {
+      const d = daysDiff(r.dueDate)
+      return d >= 0 && d <= 7
+    }).length
+
+    const endOfMonth = new Date(MOCK_TODAY)
+    endOfMonth.setDate(endOfMonth.getDate() + 30)
+    const dueThisMonth = active.filter(r => {
+      const d = daysDiff(r.dueDate)
+      return d >= 0 && d <= 30
+    }).length
+
+    const schattenmarktReadyCount = reminders.filter(
+      r =>
+        r.status === ReminderStatus.ACTIVE &&
+        !r.schattenmarktEnabled &&
+        (r.shadowMarketRisk === ShadowMarketRisk.HIGH),
+    ).length
+
+    const activeDays = active
+      .filter(r => daysDiff(r.dueDate) > 0)
+      .map(r => daysDiff(r.dueDate))
+    const avgDaysToAction = activeDays.length
+      ? Math.round(activeDays.reduce((s, d) => s + d, 0) / activeDays.length)
+      : 0
+
+    return {
+      urgentCount,
+      dueThisWeek,
+      dueThisMonth,
+      schattenmarktReadyCount,
+      avgDaysToAction,
+    }
+  },
+}