feat: overhaul groups management, remove global team_admin and isolate group administration

frontend/src/lib/api.ts

@@ -723,6 +723,13 @@ export const api = {
     });
   },
 
+  async updateTeam(teamId: string, name: string, description = ''): Promise<Team> {
+    return request<Team>(`/api/v1/teams/${teamId}`, {
+      method: 'PUT',
+      body: JSON.stringify({ name, description }),
+    });
+  },
+
   async deleteTeam(teamId: string): Promise<void> {
     await request(`/api/v1/teams/${teamId}`, { method: 'DELETE' });
   },
@@ -742,6 +749,17 @@ export const api = {
     });
   },
 
+  async updateTeamMemberRole(
+    teamId: string,
+    userId: string,
+    role: 'admin' | 'member'
+  ): Promise<void> {
+    await request(`/api/v1/teams/${teamId}/members/${userId}`, {
+      method: 'PUT',
+      body: JSON.stringify({ role }),
+    });
+  },
+
   async removeTeamMember(teamId: string, userId: string): Promise<void> {
     await request(`/api/v1/teams/${teamId}/members/${userId}`, { method: 'DELETE' });
   },