Add support tickets that work with private threads

Members open a ticket from a panel in the ticket channel: one button per
category (a dropdown past five), then a short form. Each ticket is a private
thread named after the category, number and opener, with a first message
that mentions the category's staff role so its members join, and Claim and
Close buttons.

- Claim: staff (the category's role, or Manage Threads / Manage Server)
  take a ticket; the first message shows who has it.
- Close: the opener or staff close it, with an optional reason. The thread
  is locked and archived, and the log channel gets a summary and a .txt
  transcript of the whole thread.
- /ticket add|remove|claim|close inside a ticket; /tickets setup,
  /tickets category add|remove|list and /tickets panel for admins.
- Per-member limit on open tickets (default 1), per-server ticket numbers
  handed out atomically, a deleted thread closes its ticket.
- The dashboard asks the bot to post or refresh the panel through
  ticket_commands (LISTEN/NOTIFY, like music); the listener reconnects if
  the database connection drops.
- Setup warns about missing bot permissions in the ticket and log channels.

The flows live in internal/tickets behind small Discord and store
interfaces, with unit tests on fakes; the repo and the listener have
integration tests (-tags integration, TICKETS_TEST_DB).

Needs the ticket tables (velox-dashboard-api migration 000016_tickets).
.gitignore gains the /tldr benchmark rules so private chat exports and
benchmark results on disk can't be committed from this branch.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/commands/commands.go

@@ -11,6 +11,7 @@ import (
 	cmdmusic "velox-bot/internal/commands/music"
 	"velox-bot/internal/commands/projects"
 	"velox-bot/internal/commands/schedule"
+	cmdtickets "velox-bot/internal/commands/tickets"
 	"velox-bot/internal/commands/timezone"
 	"velox-bot/internal/music"
 
@@ -40,6 +41,8 @@ var AllCommands = []*discordgo.ApplicationCommand{
 	schedule.Schedule,
 	projects.Projects,
 	config.Config,
+	cmdtickets.Tickets,
+	cmdtickets.Ticket,
 }
 
 var handlers = map[string]func(s *discordgo.Session, i *discordgo.InteractionCreate){
@@ -65,6 +68,8 @@ var handlers = map[string]func(s *discordgo.Session, i *discordgo.InteractionCre
 	"volume":         cmdmusic.VolumeHandler,
 	"music":          cmdmusic.MusicHandler,
 	"config":         config.ConfigHandler,
+	"tickets":        cmdtickets.TicketsHandler,
+	"ticket":         cmdtickets.TicketHandler,
 }
 
 func HandleInteraction(s *discordgo.Session, i *discordgo.InteractionCreate) {
@@ -82,6 +87,8 @@ func HandleInteraction(s *discordgo.Session, i *discordgo.InteractionCreate) {
 			schedule.HandleComponent(s, i)
 		case strings.HasPrefix(data.CustomID, "projects:"):
 			projects.HandleComponent(s, i)
+		case strings.HasPrefix(data.CustomID, "tickets:"):
+			cmdtickets.HandleComponent(s, i)
 		}
 	case discordgo.InteractionModalSubmit:
 		data := i.ModalSubmitData()
@@ -90,6 +97,8 @@ func HandleInteraction(s *discordgo.Session, i *discordgo.InteractionCreate) {
 			schedule.HandleModalSubmit(s, i)
 		case strings.HasPrefix(data.CustomID, "projects:"):
 			projects.HandleModalSubmit(s, i)
+		case strings.HasPrefix(data.CustomID, "tickets:"):
+			cmdtickets.HandleModalSubmit(s, i)
 		}
 	}