feat: 重构项目心跳数据结构并实现项目列表API

- 新增统一项目列表Redis键和迁移工具
- 实现GET /api/projects端点获取项目列表
- 实现POST /api/projects/migrate端点支持数据迁移
- 更新前端ProjectSelector组件使用真实项目数据
- 扩展projectStore状态管理
- 更新相关文档和OpenSpec规范
- 添加测试用例验证新功能

src/backend/test/fakeRedis.js

@@ -0,0 +1,53 @@
+function escapeRegex(input) {
+  return String(input).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+function globToRegex(glob) {
+  const parts = String(glob).split('*').map(escapeRegex);
+  const regex = `^${parts.join('.*')}$`;
+  return new RegExp(regex);
+}
+
+export function createFakeRedis(initial = {}) {
+  const kv = new Map(Object.entries(initial));
+
+  return {
+    isReady: true,
+
+    async get(key) {
+      return kv.has(key) ? kv.get(key) : null;
+    },
+
+    async set(key, value) {
+      kv.set(key, String(value));
+      return 'OK';
+    },
+
+    async del(key) {
+      const existed = kv.delete(key);
+      return existed ? 1 : 0;
+    },
+
+    async keys(pattern) {
+      const re = globToRegex(pattern);
+      return Array.from(kv.keys()).filter((k) => re.test(k));
+    },
+
+    // optional: used by logs route
+    async lRange(key, start, stop) {
+      const raw = kv.get(key);
+      const list = Array.isArray(raw) ? raw : [];
+
+      const normalizeIndex = (idx) => (idx < 0 ? list.length + idx : idx);
+      const s = normalizeIndex(start);
+      const e = normalizeIndex(stop);
+
+      return list.slice(Math.max(0, s), Math.min(list.length, e + 1));
+    },
+
+    // helper for tests
+    _dump() {
+      return Object.fromEntries(kv.entries());
+    },
+  };
+}