feat: 建立统一目录元数据与获取契约 (#5)

* feat: 建立 Registry 目录元数据验证基础

* feat: 迁移 Registry 应用目录元数据

* test: 解耦目录迁移进度断言

* feat: 迁移 Registry 服务目录元数据

* fix(catalog): 强制 Registry 目录元数据

* fix(catalog): 兼容 Registry v4 外部集成

entries/dify/catalog-metadata.v1.json

@@ -0,0 +1,81 @@
+{
+  "$schema": "../../schemas/catalog-metadata.v1.schema.json",
+  "schemaVersion": 1,
+  "identity": {
+    "kind": "app",
+    "id": "dify"
+  },
+  "presentation": {
+    "defaultLocale": "zh-CN",
+    "i18n": {
+      "zh-CN": {
+        "name": "Dify",
+        "summary": "开源 AI 应用开发平台，支持 RAG、Agent、工作流编排",
+        "description": "Dify 是一个开源的 LLM 应用开发平台，提供从 Agent 构建到 AI Workflow 编排、RAG 检索、模型管理等能力，轻松构建和运营生成式 AI 原生应用。支持数百种模型接入。"
+      },
+      "en-US": {
+        "name": "Dify",
+        "summary": "Open-source AI application development platform with RAG, agents, and workflow orchestration",
+        "description": "Dify is an open-source LLM application development platform that covers agent building, AI workflow orchestration, RAG retrieval, and model management. It helps teams build and operate generative AI-native applications and supports hundreds of models."
+      }
+    },
+    "tags": [
+      "LLM",
+      "RAG",
+      "Agent",
+      "Workflow"
+    ]
+  },
+  "release": {
+    "state": "known",
+    "version": "1.13.0",
+    "versionScheme": "semver"
+  },
+  "timestamps": {
+    "catalogUpdatedAt": {
+      "state": "known",
+      "value": "2026-06-16",
+      "precision": "day"
+    },
+    "releasePublishedAt": {
+      "state": "unknown"
+    },
+    "reviewedAt": {
+      "state": "unknown"
+    },
+    "upstreamObservedAt": {
+      "state": "unknown"
+    }
+  },
+  "provenance": {
+    "content": {
+      "kind": "git",
+      "url": "https://github.com/langgenius/dify"
+    }
+  },
+  "governance": {
+    "availability": "listing-only",
+    "license": {
+      "state": "unknown"
+    },
+    "redistribution": "verify-package-terms",
+    "upstreamMaintainer": {
+      "name": "Dify.AI",
+      "verified": false
+    }
+  },
+  "compatibility": {
+    "platforms": {
+      "state": "known",
+      "values": [
+        "macos",
+        "windows",
+        "linux"
+      ]
+    }
+  },
+  "spec": {
+    "kind": "app",
+    "category": "ai-platform"
+  }
+}