feat(vessel): Schiffsflotte im Profil und Logbuch-Auswahl

Benutzerweiter Vessel-Pool (E2E, Sync, Migration von Legacy-Yachts) mit
LogbookVesselSelection und LogbookVesselPicker. Profil mit Accordion
(Flotte & Crew); Demo und Onboarding-Tour inkl. profile_vessel_pool.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/services/vesselPoolSync.ts

@@ -0,0 +1,83 @@
+import { db } from './db.js'
+import { getActiveMasterKey } from './auth.js'
+import { apiFetch } from './api.js'
+
+const API_BASE = '/api/auth/vessel-pool'
+
+function isNewer(timeA: string | Date, timeB: string | Date): boolean {
+  return new Date(timeA).getTime() > new Date(timeB).getTime()
+}
+
+export async function syncVesselPool(): Promise<void> {
+  if (!navigator.onLine || !getActiveMasterKey() || !localStorage.getItem('active_userid')) return
+
+  await pushVesselPool()
+  await pullVesselPool()
+}
+
+async function pushVesselPool(): Promise<void> {
+  const pending = (await db.userSyncQueue.toArray()).filter((item) => item.type === 'vessel')
+  if (pending.length === 0) return
+
+  try {
+    const response = await apiFetch(`${API_BASE}/push`, {
+      method: 'POST',
+      body: JSON.stringify({ items: pending })
+    })
+    if (!response.ok) {
+      console.warn('Vessel pool push rejected')
+      return
+    }
+
+    const { results } = await response.json()
+    for (let i = 0; i < results.length; i++) {
+      const res = results[i]
+      const item = pending[i]
+      if (!item) continue
+      if (res.status === 'success' && item.id !== undefined) {
+        await db.userSyncQueue.delete(item.id)
+      }
+    }
+  } catch (err) {
+    console.warn('Vessel pool push failed:', err)
+  }
+}
+
+async function pullVesselPool(): Promise<void> {
+  try {
+    const response = await apiFetch(API_BASE, { method: 'GET' })
+    if (!response.ok) return
+
+    const { vessels } = await response.json()
+    if (!Array.isArray(vessels)) return
+
+    const serverMap = new Map<string, (typeof vessels)[0]>()
+    for (const v of vessels) {
+      serverMap.set(v.payloadId, v)
+      const local = await db.vesselPool.get(v.payloadId)
+      if (!local || isNewer(v.updatedAt, local.updatedAt)) {
+        await db.vesselPool.put({
+          payloadId: v.payloadId,
+          encryptedData: v.encryptedData,
+          iv: v.iv,
+          tag: v.tag,
+          updatedAt: v.updatedAt
+        })
+      }
+    }
+
+    const localAll = await db.vesselPool.toArray()
+    for (const local of localAll) {
+      if (!serverMap.has(local.payloadId)) {
+        const pendingCreate = await db.userSyncQueue
+          .where({ payloadId: local.payloadId, action: 'create' })
+          .first()
+        if (!pendingCreate) {
+          await db.vesselPool.delete(local.payloadId)
+        }
+      }
+    }
+  } catch (err) {
+    console.warn('Vessel pool pull failed:', err)
+  }
+}