feat(framework): server testing utils, transaction storage simplify, pathfinding tests (#384)

## Server Testing Utils
- Add TestServer, TestClient, MockRoom for unit testing
- Export testing utilities from @esengine/server/testing

## Transaction Storage (BREAKING)
- Simplify RedisStorage/MongoStorage to factory pattern only
- Remove DI client injection option
- Add lazy connection and Symbol.asyncDispose support
- Add 161 unit tests with full coverage

## Pathfinding Tests
- Add 150 unit tests covering all components
- BinaryHeap, Heuristics, AStarPathfinder, GridMap, NavMesh, PathSmoother

## Docs
- Update storage.md for new factory pattern API

packages/framework/server/src/testing/index.ts

@@ -0,0 +1,37 @@
+/**
+ * @zh 服务器测试工具
+ * @en Server testing utilities
+ *
+ * @example
+ * ```typescript
+ * import { createTestServer, TestClient } from '@esengine/server/testing'
+ *
+ * describe('GameRoom', () => {
+ *     let env: TestEnvironment
+ *
+ *     beforeEach(async () => {
+ *         env = await createTestEnv()
+ *         env.server.define('game', GameRoom)
+ *     })
+ *
+ *     afterEach(async () => {
+ *         await env.cleanup()
+ *     })
+ *
+ *     it('should join room', async () => {
+ *         const client = await env.createClient()
+ *         const result = await client.joinRoom('game')
+ *         expect(result.roomId).toBeDefined()
+ *     })
+ * })
+ * ```
+ */
+
+export { TestClient, type TestClientOptions } from './TestClient.js'
+export {
+    createTestServer,
+    createTestEnv,
+    type TestServerOptions,
+    type TestEnvironment,
+} from './TestServer.js'
+export { MockRoom } from './MockRoom.js'