fix: 修复 bangumi search API 中的流式接口，webui 对应接口定义方法改造

- StreamingResponse 换成 EventSourceResponse，即 Server Send Event Source 方式发送数据
- webui 中 search 接口改成 rxjs Observable 方式，
  这次来不及改到 vue 里，但是写了接口 usage example；
- 顺手补了一些 vscode 通用的开发配置，
  补了之前配置文件解析漏了一个可用环境变量的 host 字段

.vscode/extensions.json

@@ -0,0 +1,18 @@
+{
+  "recommendations": [
+    // https://marketplace.visualstudio.com/items?itemName=antfu.unocss
+    "antfu.unocss",
+    // https://marketplace.visualstudio.com/items?itemName=formulahendry.auto-rename-tag
+    "formulahendry.auto-rename-tag",
+    // https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker
+    "streetsidesoftware.code-spell-checker",
+    // https://marketplace.visualstudio.com/items?itemName=naumovs.color-highlight
+    "naumovs.color-highlight",
+    // https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance
+    "ms-python.vscode-pylance",
+    // https://marketplace.visualstudio.com/items?itemName=ms-python.python
+    "ms-python.python",
+    // https://marketplace.visualstudio.com/items?itemName=vue.volar
+    "vue.volar"
+  ]
+}