chore(activities): reroute CreateActivityDialog through TicketApiService.createEvent

The aiolabs/events extension on its signer-abstraction branch (commit
66076d6) constructs and publishes kind-31922 NIP-52 calendar events
server-side via NostrSigner — POST /events/api/v1/events accepts a
CreateEventRequest payload, signs through the operator's signer, and
broadcasts to configured relays. The webapp no longer needs to sign
calendar events client-side.

Changes:
- ActivitiesNostrService.ts: delete publishCalendarEvent() and its
  helper imports (finalizeEvent, EventTemplate, buildCalendarTimeEventTags,
  the local hexToUint8Array). The subscribe / query paths stay — the
  service still reads NIP-52 events off relays for the activity feed.
  Docstring updated to reflect the read-only role and point at the
  events extension for the publish path.
- CreateActivityDialog.vue: swap the publish flow.
  - Drop ActivitiesNostrService injection + currentUser.value.prvkey read.
  - Inject TicketApiService instead; pull invoiceKey from
    currentUser.value.wallets[0].inkey (same pattern as EventsPage.vue
    handleCreateEvent).
  - Build CreateEventRequest with amount_tickets: 0, price_per_ticket: 0
    (events extension treats 0 as unlimited/not-ticketed per
    models.py:45-46 per lnbits 22:30Z audit).
  - Fold summary + description into the events extension's `info`
    field since CreateEventRequest has no separate summary slot.
  - Update toast on success to "Activity created!" (server publishes
    to relays via the signer, not the webapp).

Approval-workflow caveat documented inline in the submit handler:
non-admin users on instances with auto_approve=false (the default)
land in the proposal queue and don't publish to relays until an admin
approves. Admins / auto_approve=true instances publish immediately.
This is the intended new behavior — operators can flip auto_approve
on the events extension config per-instance if they want the legacy
direct-publish moderation posture.

This is webapp's second bucket-A leg per aiolabs/lnbits#9 phase-1.
The remaining `currentUser.value.prvkey` reads stay until the
atomic User.prvkey field-removal PR (Q1.2 Option (b)).

Refs:
- log:2026-05-28T22:30Z (lnbits Q2.1 audit verifying ticket-less
  acceptance + approval-workflow caveat)
- ~/dev/coordination/webapp-design-questions.md Q2.1
- aiolabs/events signer-abstraction commit 66076d6 (the server-side
  publish path)
- aiolabs/lnbits cascade tip 861f427c deployed to aio-demo

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/modules/activities/components/CreateActivityDialog.vue

@@ -16,8 +16,8 @@ import { Button } from '@/components/ui/button'
 import { CalendarPlus } from 'lucide-vue-next'
 import { useAuth } from '@/composables/useAuthService'
 import { tryInjectService, SERVICE_TOKENS } from '@/core/di-container'
-import type { ActivitiesNostrService } from '../services/ActivitiesNostrService'
-import type { CalendarTimeEvent } from '../types/nip52'
+import type { TicketApiService } from '../services/TicketApiService'
+import type { CreateEventRequest } from '../types/ticket'
 import type { ActivityCategory } from '../types/category'
 import CategorySelector from './CategorySelector.vue'
 import LocationPicker from './LocationPicker.vue'
@@ -67,56 +67,64 @@ const form = useForm({
 const isFormValid = computed(() => form.meta.value.valid)
 
 const onSubmit = form.handleSubmit(async (values) => {
-  const nostrService = tryInjectService<ActivitiesNostrService>(SERVICE_TOKENS.ACTIVITIES_NOSTR_SERVICE)
-  if (!nostrService) {
+  const ticketApi = tryInjectService<TicketApiService>(SERVICE_TOKENS.TICKET_API)
+  if (!ticketApi) {
     toast.error('Activities service not available')
     return
   }
 
-  const signingKey = currentUser.value?.prvkey
-  if (!signingKey) {
-    toast.error('Signing key not available. Please log in again.')
+  const invoiceKey = currentUser.value?.wallets?.[0]?.inkey
+  if (!invoiceKey) {
+    toast.error('No wallet available. Please log in first.')
     return
   }
 
   isPublishing.value = true
 
   try {
-    // Build unix timestamps
-    const startTimestamp = Math.floor(new Date(`${values.startDate}T${values.startTime}`).getTime() / 1000)
-    let endTimestamp: number | undefined
-    if (values.endDate && values.endTime) {
-      endTimestamp = Math.floor(new Date(`${values.endDate}T${values.endTime}`).getTime() / 1000)
+    // Compose ISO 8601 datetime strings the events extension parses.
+    const startIso = `${values.startDate}T${values.startTime}`
+    const endIso =
+      values.endDate && values.endTime
+        ? `${values.endDate}T${values.endTime}`
+        : undefined
+
+    // Fold summary + description into `info` since the events extension
+    // CreateEventRequest has no separate summary field.
+    const info =
+      values.summary && values.description
+        ? `${values.summary}\n\n${values.description}`
+        : values.description || values.summary || ''
+
+    // Ticket-less activity — amount_tickets and price_per_ticket both
+    // pinned at 0 (events extension treats 0 as "unlimited / not
+    // ticketed" per models.py:45-46). Server-side `signer.sign_event`
+    // produces the kind-31922 calendar event and publishes via the
+    // operator's configured relays — no webapp signing path needed.
+    const eventData: CreateEventRequest = {
+      name: values.title,
+      info,
+      event_start_date: startIso,
+      event_end_date: endIso,
+      location: location.value || null,
+      banner: values.image || null,
+      categories: selectedCategories.value,
+      amount_tickets: 0,
+      price_per_ticket: 0,
     }
 
-    // Generate a unique d-tag
-    const dTag = `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`
+    await ticketApi.createEvent(eventData, invoiceKey)
 
-    const eventData: Partial<CalendarTimeEvent> = {
-      dTag,
-      title: values.title,
-      summary: values.summary || undefined,
-      content: values.description,
-      image: values.image || undefined,
-      start: startTimestamp,
-      end: endTimestamp,
-      startTzid: Intl.DateTimeFormat().resolvedOptions().timeZone,
-      location: location.value || undefined,
-      hashtags: selectedCategories.value,
-    }
-
-    const result = await nostrService.publishCalendarEvent(eventData, signingKey)
-
-    if (result.success > 0) {
-      toast.success(`Activity published to ${result.success} relay${result.success > 1 ? 's' : ''}`)
-      emit('created')
-      handleClose()
-    } else {
-      toast.error('Failed to publish to any relay')
-    }
+    // Approval workflow caveat: non-admin users on instances with
+    // `auto_approve=false` (the default) land in the proposal queue;
+    // their event isn't published to relays until an admin approves.
+    // Admins-and-auto-approve-on instances publish immediately.
+    toast.success('Activity created!')
+    emit('created')
+    handleClose()
   } catch (err) {
-    console.error('Failed to publish activity:', err)
-    toast.error(err instanceof Error ? err.message : 'Failed to publish activity')
+    console.error('Failed to create activity:', err)
+    toast.error(err instanceof Error ? err.message : 'Failed to create activity')
   } finally {
     isPublishing.value = false
   }

src/modules/activities/services/ActivitiesNostrService.ts

@@ -1,12 +1,10 @@
 import { BaseService } from '@/core/base/BaseService'
-import { finalizeEvent, type Event as NostrEvent, type EventTemplate } from 'nostr-tools'
+import type { Event as NostrEvent } from 'nostr-tools'
 import type { SubscriptionConfig } from '@/modules/base/nostr/relay-hub'
 import {
   NIP52_KINDS,
   parseCalendarTimeEvent,
   parseCalendarDateEvent,
-  buildCalendarTimeEventTags,
-  type CalendarTimeEvent,
 } from '../types/nip52'
 import {
   calendarTimeEventToActivity,
@@ -30,7 +28,15 @@ export interface CalendarEventFilters {
 }
 
 /**
- * Service for subscribing to and publishing NIP-52 Calendar Events via RelayHub.
+ * Service for subscribing to NIP-52 Calendar Events via RelayHub.
+ *
+ * Publishing kind-31922 calendar events lives server-side in the
+ * `aiolabs/events` LNbits extension (signer-abstraction branch, commit
+ * 66076d6) — `POST /events/api/v1/events` constructs and signs the
+ * event via NostrSigner and broadcasts it to the operator's configured
+ * relays. The webapp constructs only the request payload; see
+ * CreateActivityDialog for the flow.
+ *
  * Extends BaseService for standardized dependency injection and lifecycle.
  */
 export class ActivitiesNostrService extends BaseService {
@@ -107,32 +113,6 @@ export class ActivitiesNostrService extends BaseService {
     return activities
   }
 
-  /**
-   * Publish a NIP-52 time-based calendar event.
-   * Requires an authenticated user with a signing key.
-   */
-  async publishCalendarEvent(
-    eventData: Partial<CalendarTimeEvent>,
-    signingKeyHex: string
-  ): Promise<{ success: number; total: number }> {
-    if (!this.relayHub) {
-      throw new Error('RelayHub not available')
-    }
-
-    const tags = buildCalendarTimeEventTags(eventData)
-    const template: EventTemplate = {
-      kind: NIP52_KINDS.CALENDAR_TIME_EVENT,
-      created_at: Math.floor(Date.now() / 1000),
-      content: eventData.content ?? '',
-      tags,
-    }
-
-    const privkeyBytes = hexToUint8Array(signingKeyHex)
-    const signedEvent = finalizeEvent(template, privkeyBytes)
-
-    return await this.relayHub.publishEvent(signedEvent)
-  }
-
   /**
    * Parse a raw Nostr event into an Activity view model.
    */
@@ -182,11 +162,3 @@ export class ActivitiesNostrService extends BaseService {
     this.activeUnsubscribes = []
   }
 }
-
-function hexToUint8Array(hex: string): Uint8Array {
-  const bytes = new Uint8Array(hex.length / 2)
-  for (let i = 0; i < hex.length; i += 2) {
-    bytes[i / 2] = parseInt(hex.substr(i, 2), 16)
-  }
-  return bytes
-}