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

sources/event.v

@@ -2,27 +2,39 @@ module sources
 
 pub struct Event {
 pub mut:
-	source   string
-	name     string
-	topic    string
-	priority int
-	tags     []string
-	message  string
-	raw      string
+	source    string
+	name      string
+	topic     string
+	priority  int
+	tags      []string
+	message   string
+	raw       string
+	click_url string   // v0.5: URL opened when notification is clicked
+	actions   []Action  // v0.5: Ntfy action buttons
 }
 
 pub fn (e Event) clone() Event {
 	return Event{
-		source:   e.source
-		name:     e.name
-		topic:    e.topic
-		priority: e.priority
-		tags:     e.tags.clone()
-		message:  e.message
-		raw:      e.raw
+		source:    e.source
+		name:      e.name
+		topic:     e.topic
+		priority:  e.priority
+		tags:      e.tags.clone()
+		message:   e.message
+		raw:       e.raw
+		click_url: e.click_url
+		actions:   e.actions.clone()
 	}
 }
 
+pub struct Action {
+pub:
+	action string // view, broadcast, http
+	label  string
+	url    string
+	clear  bool // whether to dismiss notification after action
+}
+
 pub struct GiteaSource {
 pub mut:
 	name         string         @[json: 'name']