add tags

Trip-level tags: admins configure available tags in the trip header (inline add/remove pills). The AI can also create new tags via the add_tag tool.
Event tags: selectable in the Add Event modal, shown as colored pills on event cards in the timeline, and on AI suggestion cards.
AI integration: sees available tags in its system prompt, applies them when proposing events, can create new ones with add_tag.
Discord: tags shown as inline code blocks under each event in /trip view.
Colors: auto-assigned from an 8-color palette by tag index, consistent everywhere.

drb-server-discord-bot/app/commands/trips.py

@@ -248,6 +248,10 @@ class TripCommands(commands.Cog):
                 if e.get("notes"):
                     line += f"\n\u3000\u3000_{e['notes']}_"
 
+                event_tags = e.get("tags") or []
+                if event_tags:
+                    line += f"\n\u3000\u3000`{'` `'.join(event_tags)}`"
+
                 event_att = list(e.get("attendees", {}).values())
                 if event_att:
                     line += f"\n\u3000\u3000{', '.join(event_att)}"