feat: 初始化 DesireCore Registry 数据仓库

- 添加应用商店数据（Dify, RagFlow, Open WebUI）
- 添加服务注册表数据（Filesystem MCP, GitHub MCP）
- 添加服务描述符（chat, reasoning, embedding）
- 添加服务分类（language, voice, vision, vector）
- 添加 UI 配置文件
- 添加仓库元数据和说明文档

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

manifest.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "id": "desirecore-registry-manifest",
+  "version": "1.0.0",
+  "name": "DesireCore Registry",
+  "description": "DesireCore 官方应用商店与服务注册表",
+  "maintainer": "DesireCore Team",
+  "repository": "https://github.com/desirecore/registry",
+  "lastUpdated": "2026-02-16",
+  "dataVersion": {
+    "apps": "1.0.0",
+    "services": "1.0.0",
+    "descriptors": "1.0.0",
+    "categories": "1.0.0"
+  }
+}