feat: add templates for epics, product brief, and requirements PRD

- Created a new directory structure for epics and stories with templates for individual epics and an index file.
- Added a product brief template for generating product brief documents in Phase 2.
- Introduced a requirements PRD template for generating a Product Requirements Document as a directory of individual requirement files in Phase 3.

feat: implement V2PipelineTab component for Memory V2 management

- Developed the V2PipelineTab component to manage extraction and consolidation processes.
- Included ExtractionCard and ConsolidationCard components to handle respective functionalities.
- Added JobsList component to display job statuses and allow filtering by job kind.

feat: create hooks for Memory V2 pipeline

- Implemented custom hooks for managing extraction and consolidation statuses, as well as job listings.
- Added mutation hooks to trigger extraction and consolidation processes with automatic query invalidation on success.

ccw/frontend/src/hooks/useMemoryV2.ts

@@ -0,0 +1,101 @@
+// ========================================
+// useMemoryV2 Hook
+// ========================================
+// TanStack Query hooks for Memory V2 pipeline
+
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import {
+  triggerExtraction,
+  getExtractionStatus,
+  triggerConsolidation,
+  getConsolidationStatus,
+  getV2Jobs,
+  type ExtractionStatus,
+  type ConsolidationStatus,
+  type V2JobsResponse,
+} from '../lib/api';
+import { useWorkflowStore, selectProjectPath } from '@/stores/workflowStore';
+
+// Query keys
+export const memoryV2Keys = {
+  all: ['memoryV2'] as const,
+  extractionStatus: (path?: string) => [...memoryV2Keys.all, 'extraction', path] as const,
+  consolidationStatus: (path?: string) => [...memoryV2Keys.all, 'consolidation', path] as const,
+  jobs: (path?: string, filters?: { kind?: string; status_filter?: string }) =>
+    [...memoryV2Keys.all, 'jobs', path, filters] as const,
+};
+
+// Default stale time: 30 seconds (V2 status changes frequently)
+const STALE_TIME = 30 * 1000;
+
+// Hook: 提取状态
+export function useExtractionStatus() {
+  const projectPath = useWorkflowStore(selectProjectPath);
+
+  return useQuery({
+    queryKey: memoryV2Keys.extractionStatus(projectPath),
+    queryFn: () => getExtractionStatus(projectPath),
+    enabled: !!projectPath,
+    staleTime: STALE_TIME,
+    refetchInterval: 5000, // 每 5 秒刷新
+  });
+}
+
+// Hook: 合并状态
+export function useConsolidationStatus() {
+  const projectPath = useWorkflowStore(selectProjectPath);
+
+  return useQuery({
+    queryKey: memoryV2Keys.consolidationStatus(projectPath),
+    queryFn: () => getConsolidationStatus(projectPath),
+    enabled: !!projectPath,
+    staleTime: STALE_TIME,
+    refetchInterval: 5000,
+  });
+}
+
+// Hook: V2 作业列表
+export function useV2Jobs(filters?: { kind?: string; status_filter?: string }) {
+  const projectPath = useWorkflowStore(selectProjectPath);
+
+  return useQuery({
+    queryKey: memoryV2Keys.jobs(projectPath, filters),
+    queryFn: () => getV2Jobs(filters, projectPath),
+    enabled: !!projectPath,
+    staleTime: STALE_TIME,
+    refetchInterval: 10000, // 每 10 秒刷新
+  });
+}
+
+// Hook: 触发提取
+export function useTriggerExtraction() {
+  const queryClient = useQueryClient();
+  const projectPath = useWorkflowStore(selectProjectPath);
+
+  return useMutation({
+    mutationFn: (maxSessions?: number) => triggerExtraction(maxSessions, projectPath),
+    onSuccess: () => {
+      // Invalidate related queries
+      queryClient.invalidateQueries({ queryKey: memoryV2Keys.extractionStatus(projectPath) });
+      queryClient.invalidateQueries({ queryKey: memoryV2Keys.jobs(projectPath) });
+    },
+  });
+}
+
+// Hook: 触发合并
+export function useTriggerConsolidation() {
+  const queryClient = useQueryClient();
+  const projectPath = useWorkflowStore(selectProjectPath);
+
+  return useMutation({
+    mutationFn: () => triggerConsolidation(projectPath),
+    onSuccess: () => {
+      // Invalidate related queries
+      queryClient.invalidateQueries({ queryKey: memoryV2Keys.consolidationStatus(projectPath) });
+      queryClient.invalidateQueries({ queryKey: memoryV2Keys.jobs(projectPath) });
+    },
+  });
+}
+
+// Export types
+export type { ExtractionStatus, ConsolidationStatus, V2JobsResponse };