Initial commit: HZHub project setup with RuoYi-AI base

docs/architecture/hzhub-architecture.mmd

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+graph TB
+    subgraph 前端层["🖥️ 前端接入层"]
+        A1["hzhub-admin<br/>管理后台"]
+        A2["hzhub-portal-company<br/>公司门户"]
+        A3["hzhub-portal-dealer<br/>经销商门户"]
+    end
+
+    subgraph 网关层["🌐 API网关层"]
+        B["HZHub-Gateway<br/>统一鉴权/路由/限流"]
+    end
+
+    subgraph 服务层["⚙️ 核心服务层"]
+        C1["hzhub-ai<br/>AI服务"]
+        C2["hzhub-erp<br/>ERP服务"]
+        C3["n8n<br/>工作流引擎"]
+    end
+
+    subgraph 数据层["💾 数据存储层"]
+        D1["MySQL<br/>业务数据"]
+        D2["Milvus<br/>向量数据"]
+        D3["SQL Server 2008 R2<br/>ERP数据"]
+    end
+
+    A1 --> B
+    A2 --> B
+    A3 --> B
+
+    B --> C1
+    B --> C2
+    B --> C3
+
+    C1 --> D1
+    C1 --> D2
+    C2 --> D3
+
+    C1 -.->|工作流调用| C3
+
+    style A1 fill:#e1f5fe
+    style A2 fill:#e1f5fe
+    style A3 fill:#e1f5fe
+    style B fill:#fff3e0
+    style C1 fill:#e8f5e9
+    style C2 fill:#e8f5e9
+    style C3 fill:#fce4ec
+    style D1 fill:#f3e5f5
+    style D2 fill:#f3e5f5
+    style D3 fill:#f3e5f5