feat: groupes de travail (P5)

Ajoute la notion de groupe — collection nommée de repos (membership légère
persistée, many-to-many) — pour piloter plusieurs repos en simultané :

- DB : migration #5 (tables groups + group_repos, FK ON DELETE CASCADE).
- GroupManager (synchrone, EventEmitter) + routes REST /api/v1/groups ;
  ne persiste que la membership, worktrees/sessions filtrés par repoId côté client.
- Protocole : GroupSummary, DTOs, topic WS « groups », events group_update/removed
  (additifs, PROTOCOL_VERSION inchangé).
- Web : store groups, GroupsListView, GroupView (réutilise RepoSection),
  grille multi-terminaux (TerminalGrid/TerminalCell), action « feature cross-repo »
  (orchestration client, tolérante aux échecs partiels), routes + i18n EN/FR.
- Tests : group-manager.test.ts + extension protocol.test.ts ; acceptance-p5.mjs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/server/src/app.ts

@@ -11,10 +11,12 @@ import { AuthService, LoginRateLimiter, type AuthContext } from './auth/service.
 import { PtyManager } from './core/pty-manager.js';
 import { DiscoveryService } from './core/discovery-service.js';
 import { WorktreeManager } from './core/worktree-manager.js';
+import { GroupManager } from './core/group-manager.js';
 import { PushService } from './core/push-service.js';
 import { registerAuthRoutes } from './routes/auth.js';
 import { registerSessionRoutes } from './routes/sessions.js';
 import { registerRepoRoutes } from './routes/repos.js';
+import { registerGroupRoutes } from './routes/groups.js';
 import { registerWorktreeRoutes } from './routes/worktrees.js';
 import { registerPushRoutes } from './routes/push.js';
 import { registerFsRoutes } from './routes/fs.js';
@@ -35,6 +37,7 @@ export interface AppBundle {
   manager: PtyManager;
   discovery: DiscoveryService;
   worktrees: WorktreeManager;
+  groups: GroupManager;
   push: PushService;
 }
 
@@ -50,6 +53,7 @@ export function buildApp(config: Config, db: Db, serverVersion: string): AppBund
     sessionsDir: config.claudeSessionsDir,
   });
   const worktrees = new WorktreeManager(db, manager, discovery);
+  const groups = new GroupManager(db);
 
   void app.register(fastifyCookie);
   void app.register(fastifyWebsocket, {
@@ -91,13 +95,14 @@ export function buildApp(config: Config, db: Db, serverVersion: string): AppBund
   registerAuthRoutes(app, auth, limiter, serverVersion);
   registerSessionRoutes(app, manager, discovery);
   registerRepoRoutes(app, worktrees);
+  registerGroupRoutes(app, groups);
   registerWorktreeRoutes(app, worktrees);
   registerPushRoutes(app, push);
   registerFsRoutes(app);
   // La route websocket doit être déclarée APRÈS le chargement du plugin (contexte
   // encapsulé) — sinon le handler reçoit la signature REST (request, reply).
   void app.register(async (scoped) => {
-    registerWsGateway(scoped, manager, discovery, worktrees, serverVersion);
+    registerWsGateway(scoped, manager, discovery, worktrees, groups, serverVersion);
   });
 
   // SPA buildée embarquée dans le paquet npm (public/) — absente en dev (vite dev sert le front)
@@ -112,5 +117,5 @@ export function buildApp(config: Config, db: Db, serverVersion: string): AppBund
     });
   }
 
-  return { app, auth, manager, discovery, worktrees, push };
+  return { app, auth, manager, discovery, worktrees, groups, push };
 }