feat: 增加项目管理功能

引入 SQLite 数据库（Drizzle ORM + bun:sqlite），实现项目 CRUD 与归档/恢复/删除
生命周期管理，新增项目管理前端页面，migration 嵌入单文件构建产物保持部署体验。

- src/server/db: schema、connection、migration 执行器、项目数据访问层
- src/server/routes/projects: 7 个 API 端点（列表/创建/详情/更新/归档/恢复/删除）
- src/web: 项目管理页面（TDesign Table/Tabs/Dialog/Form），TanStack Query hooks
- scripts: 构建时嵌入 migration SQL，开发期独立 generate-migrations-data 脚本
- tests: 60 个后端测试 + 27 个前端测试，覆盖 DB/migration/API/路由/页面
- docs: 更新架构、后端、发布、配置、部署、使用文档

tests/server/db/connection.test.ts

@@ -0,0 +1,64 @@
+import { describe, expect, test } from "bun:test";
+import { existsSync, mkdirSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+import { createDatabase } from "../../../src/server/db/connection";
+import { createMemoryLogger } from "../../../src/server/logger";
+
+function makeTempDir(): string {
+  const dir = join(tmpdir(), `db-test-${Date.now()}-${Math.random().toString(36).slice(2)}`);
+  mkdirSync(dir, { recursive: true });
+  return dir;
+}
+
+describe("数据库初始化", () => {
+  test("创建数据库文件并设置 PRAGMA", () => {
+    const dir = makeTempDir();
+    const logger = createMemoryLogger();
+    try {
+      const db = createDatabase(dir, logger);
+      const journalMode = db.query("PRAGMA journal_mode").get() as { journal_mode: string };
+      expect(journalMode.journal_mode).toBe("wal");
+
+      const foreignKeys = db.query("PRAGMA foreign_keys").get() as { foreign_keys: number };
+      expect(foreignKeys.foreign_keys).toBe(1);
+
+      // PRAGMA busy_timeout was set (Bun SQLite may return different formats)
+      const timeoutResult = db.query("PRAGMA busy_timeout").get() as Record<string, unknown>;
+      expect(timeoutResult).not.toBeNull();
+
+      db.close();
+    } finally {
+      rmSync(dir, { force: true, recursive: true });
+    }
+  });
+
+  test("在空数据目录中创建 alfred.db", () => {
+    const dir = makeTempDir();
+    const logger = createMemoryLogger();
+    try {
+      const db = createDatabase(dir, logger);
+      db.close();
+
+      expect(existsSync(join(dir, "alfred.db"))).toBe(true);
+    } finally {
+      rmSync(dir, { force: true, recursive: true });
+    }
+  });
+
+  test("数据库连接可执行查询", () => {
+    const dir = makeTempDir();
+    const logger = createMemoryLogger();
+    try {
+      const db = createDatabase(dir, logger);
+      db.exec("CREATE TABLE test (id TEXT PRIMARY KEY)");
+      db.exec("INSERT INTO test (id) VALUES ('1')");
+      const row = db.query("SELECT id FROM test WHERE id = '1'").get() as { id: string };
+      expect(row.id).toBe("1");
+      db.close();
+    } finally {
+      rmSync(dir, { force: true, recursive: true });
+    }
+  });
+});