feat(v1.1.5): pubsub::publish_durable SDK + pubsub:* triggers

Durable pub/sub through the universal outbox — the sixth trigger kind.

- `pubsub::publish_durable(topic, message)` Rhai SDK (no handle; topics
  ARE the grouping unit). Message JSON-encoded; Blobs base64 at any
  depth.
- `PubsubService` trait in picloud-shared with the topic matcher +
  validator (exact / `<prefix>.*` / `*`; mid-pattern wildcards
  rejected). `PostgresPubsubRepo` + `PubsubServiceImpl` in manager-core.
- Publish-time fan-out: one outbox row per matching enabled pubsub
  trigger, all in ONE transaction (no half-fan-out on crash). No
  matching trigger → publish succeeds silently, zero rows.
- `pubsub:*` trigger kind via Layout-E (0020: widen both CHECKs +
  pubsub_trigger_details + partial index), TriggerEvent::Pubsub +
  ctx.event.pubsub, dispatcher arm, admin endpoint POST /triggers/pubsub
  (validates topic pattern + reuses validate_trigger_target).
- AppPubsubPublish capability → script:write (seven-scope held).
- Dashboard Pub/Sub trigger form on the Triggers tab + list rendering.

publish_ephemeral stays deferred to v1.2. ~18 new tests (service
in-memory incl. transactional-rollback, shared matcher, bridge
encoding). No DB required for the suite.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

dashboard/src/lib/api.ts

@@ -261,6 +261,15 @@ export interface CreateCronTriggerInput {
 	retry_base_ms?: number;
 }
 
+export interface CreatePubsubTriggerInput {
+	script_id: string;
+	topic_pattern: string;
+	dispatch_mode?: TriggerDispatchMode;
+	retry_max_attempts?: number;
+	retry_backoff?: 'exponential' | 'linear' | 'constant';
+	retry_base_ms?: number;
+}
+
 export interface ExecutionResult {
 	status: number;
 	headers: Record<string, string>;
@@ -632,6 +641,11 @@ export const api = {
 				`/api/v1/admin/apps/${encodeURIComponent(idOrSlug)}/triggers/cron`,
 				{ method: 'POST', body: JSON.stringify(input) }
 			),
+		createPubsub: (idOrSlug: string, input: CreatePubsubTriggerInput) =>
+			adminRequest<Trigger>(
+				`/api/v1/admin/apps/${encodeURIComponent(idOrSlug)}/triggers/pubsub`,
+				{ method: 'POST', body: JSON.stringify(input) }
+			),
 		remove: (idOrSlug: string, triggerId: string) =>
 			adminRequest<null>(
 				`/api/v1/admin/apps/${encodeURIComponent(idOrSlug)}/triggers/${triggerId}`,