feat: Phase 5 — filtres, actions Ntfy, outgoing webhooks, state file

- Filtres avancés: drop, set_priority, add_tag avec wildcard * (filter_outgoing.v)
- Notifications structurées: click_url + actions (ntfy.v + sources/event.v)
- Webhook sortant: Slack, Discord, JSON (filter_outgoing.v)
- Fichier d'état: persistance poll_state + silence_until (filter_outgoing.v)
- Config: sections filters, outgoing, state (config.v)
- Tests: 9 nouveaux tests unitaires (filter_outgoing_test.v)
- Docs: ROADMAP Phase 5 4/8, version 0.5.0

server.v

@@ -340,6 +340,12 @@ fn (mut app App) verify_hmac(payload string, sig_header string) bool {
 pub fn (mut app App) publish(event sources.Event) {
 	mut e := apply_defaults(event, app.cfg.defaults)
 
+	// v0.5 — Apply filters
+	if !app.apply_filters(mut e) {
+		app.logger.debug('server', 'filter', 'dropped event ${e.source}:${e.name}')
+		return
+	}
+
 	// Check silence
 	now := time.now()
 	if now < app.silence_until {
@@ -582,6 +588,9 @@ fn (mut app App) flush_group_buffer() {
 		app.logger.info('server', 'publish',
 			'${e.source}:${e.name} → ${e.topic} (grouped ×${total_count})')
 		app.add_recent_event(now, e, true)
+
+		// v0.5 — Dispatch to outgoing webhooks
+		app.dispatch_outgoing(e)
 	}
 	app.group_buffer = map[string][]GroupEntry{}
 	app.group_last_flush = time.now()