Add Discord event announcement functionality to backend

This commit introduces a new Discord event announcer to the backend, allowing for event announcements via Discord. It includes the addition of new environment variables for Discord configuration in `.env.example` and `compose.yaml`. The `main.go` file has been updated to initialize the announcer, and a new `discord` package has been created, containing the announcer logic and tests. Additionally, the service layer has been modified to support bracket draft management, enhancing the overall event workflow. Integration tests have been updated to ensure proper functionality of the new features.

frontend/src/api/client.ts

@@ -46,7 +46,7 @@ export interface MixEvent {
   activeSeriesId?: string
   tournamentId?: string
 }
-export type EventWorkflowState = 'RegistrationOpen' | 'RegistrationClosed' | 'Balancing' | 'RostersDraft' | 'RostersConfirmed' | 'Live' | 'Completed' | 'Cancelled'
+export type EventWorkflowState = 'RegistrationOpen' | 'RegistrationClosed' | 'Balancing' | 'RostersDraft' | 'RostersConfirmed' | 'BracketDraft' | 'Live' | 'Completed' | 'Cancelled'
 export interface TeamPlayer { player: Player; assignedRole: PlayerRole }
 export interface Team {
   id: string
@@ -122,6 +122,27 @@ export interface EventInput {
   endsAt: string
   registrationDeadline: string
 }
+export type BracketSlotSource =
+  | { kind: 'Team'; teamId: string; matchId?: never }
+  | { kind: 'Winner' | 'Loser'; matchId: string; teamId?: never }
+export interface BracketDraftMatch {
+  id: string
+  round: number
+  order: number
+  slotA: BracketSlotSource
+  slotB: BracketSlotSource
+  seriesId?: string
+  teamAId?: string
+  teamBId?: string
+  winnerTeamId?: string
+}
+export interface BracketDraft {
+  eventId: string
+  teamIds: string[]
+  matches: BracketDraftMatch[]
+  version: number
+  confirmed: boolean
+}
 
 // Raw backend DTOs mirror Go's current camelCase JSON tags exactly.
 export interface RawAccount {
@@ -174,7 +195,7 @@ export interface RawSeries {
 export interface RawDraftAction { teamId: string; value: string; actorAccountId: string; at: string }
 export interface RawTournament {
   id: string; eventId: string; name: string; winnerTeamId: string
-  teamIds: string[]; rounds: RawSeries[][]
+  teamIds: string[]; rounds: RawSeries[][]; matches?: Array<BracketDraftMatch & { series?: RawSeries }>; version?: number
 }
 export interface RawRealtimeEvent { topic: string; data: unknown }
 
@@ -391,6 +412,37 @@ export function adaptSeries(raw: RawSeries, teams: Team[] = []): Series {
 }
 export function adaptTournament(raw: RawTournament, teams: Team[] = []): Bracket {
   const names = new Map(teams.map((team) => [team.id, team.name]))
+  if (raw.matches?.length) {
+    const maxRound = Math.max(...raw.matches.map((match) => match.round))
+    const sourceName = (source: BracketSlotSource) => {
+      if (source.kind === 'Team') return names.get(source.teamId) ?? source.teamId
+      const upstream = raw.matches?.find((match) => match.id === source.matchId)
+      return `${source.kind} of ${upstream ? `R${upstream.round + 1}M${upstream.order + 1}` : 'match'}`
+    }
+    return {
+      id: raw.id,
+      title: raw.name,
+      rounds: Array.from({ length: maxRound + 1 }, (_, index) => index === maxRound ? 'Grand Final' : index === maxRound - 1 ? 'Semifinals' : `Round ${index + 1}`),
+      matches: raw.matches.map((match) => {
+        const adapted = match.series ? adaptSeries(match.series, teams) : undefined
+        return {
+          id: match.id,
+          round: match.round,
+          slot: match.order,
+          label: `Match ${match.order + 1}`,
+          teamAlpha: names.get(match.teamAId ?? '') ?? match.teamAId ?? sourceName(match.slotA),
+          teamBeta: names.get(match.teamBId ?? '') ?? match.teamBId ?? sourceName(match.slotB),
+          teamAlphaId: match.teamAId,
+          teamBetaId: match.teamBId,
+          scoreAlpha: adapted?.score.alpha,
+          scoreBeta: adapted?.score.beta,
+          winner: match.winnerTeamId ? (match.winnerTeamId === match.teamAId ? 'alpha' : 'beta') : undefined,
+          seriesId: match.seriesId ?? match.series?.id,
+          status: match.winnerTeamId ? 'completed' : match.series?.phase ? 'live' : match.teamAId && match.teamBId ? 'ready' : 'pending',
+        }
+      }),
+    }
+  }
   return {
     id: raw.id,
     title: raw.name,
@@ -599,6 +651,15 @@ export const api = {
       method: 'POST',
       body: JSON.stringify({ expectedVersion, expectedRosterVersion }),
     }),
+  bracketDraft: (eventId: string) => request<BracketDraft>(`/events/${eventId}/bracket-draft`),
+  initializeBracket: (eventId: string, expectedVersion: number) =>
+    request<BracketDraft>(`/events/${eventId}/bracket-draft/initialize`, { method: 'POST', body: JSON.stringify({ expectedVersion }) }),
+  updateBracket: (eventId: string, matches: BracketDraftMatch[], expectedVersion: number) =>
+    request<BracketDraft>(`/events/${eventId}/bracket-draft`, { method: 'PUT', body: JSON.stringify({ matches, expectedVersion }) }),
+  resetBracket: (eventId: string, expectedVersion: number) =>
+    request<BracketDraft>(`/events/${eventId}/bracket-draft/reset`, { method: 'POST', body: JSON.stringify({ expectedVersion }) }),
+  confirmBracket: (eventId: string, expectedVersion: number) =>
+    request<BracketDraft>(`/events/${eventId}/bracket-draft/confirm`, { method: 'POST', body: JSON.stringify({ expectedVersion }) }),
   startScrim: async (eventId: string, expectedVersion: number) => {
     const result = await request<{ event: RawEvent; series?: RawSeries; tournament?: RawTournament }>(`/events/${eventId}/start`, {
       method: 'POST',