修复 WUI Kanban 看板选择与隔离 (#594)

* fix: add explicit kanban board selection

* fix: tighten kanban board counts and management

tests/server/kanban-routes.test.ts

@@ -1,6 +1,10 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 const handlers = {
+  listBoards: vi.fn(async (ctx: any) => { ctx.body = { boards: [] } }),
+  createBoard: vi.fn(async (ctx: any) => { ctx.body = { board: {} } }),
+  archiveBoard: vi.fn(async (ctx: any) => { ctx.body = { ok: true } }),
+  capabilities: vi.fn(async (ctx: any) => { ctx.body = { capabilities: {} } }),
   stats: vi.fn(async (ctx: any) => { ctx.body = { stats: {} } }),
   assignees: vi.fn(async (ctx: any) => { ctx.body = { assignees: [] } }),
   readArtifact: vi.fn(async (ctx: any) => { ctx.body = { content: 'x' } }),
@@ -27,6 +31,9 @@ describe('kanban routes', () => {
     const paths = kanbanRoutes.stack.map((entry: any) => entry.path)
 
     expect(paths).toEqual(expect.arrayContaining([
+      '/api/hermes/kanban/boards',
+      '/api/hermes/kanban/boards/:slug',
+      '/api/hermes/kanban/capabilities',
       '/api/hermes/kanban/stats',
       '/api/hermes/kanban/assignees',
       '/api/hermes/kanban/artifact',