refactor(phase3): remove OpenClaw compatibility layer

Phase 3 Configuration Migration completed:
- Remove OpenClaw backend type selector from General.tsx
- Update default workspace path from ~/.openclaw to ~/.openfang
- Update default port from 18789 to 50051
- Archive openclaw.default.json to docs/archive/openclaw-legacy/
- Remove OpenClaw migration UI from Workspace settings
- Update About.tsx to reference OpenFang
- Clean up gateway-client.ts comments

All OpenClaw compatibility code removed. ZCLAW now exclusively
targets OpenFang (Rust Agent OS) backend.

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

docs/SYSTEM_ANALYSIS.md

@@ -240,7 +240,7 @@ ZCLAW 是基于 **OpenFang** (Rust Agent OS) 的 AI Agent 桌面客户端，核
 |------|------|------|
 | 迁移 openclaw.default.json | 转换为 config.toml | ✅ 已完成 |
 | 补充主 config.toml | OpenFang 服务器配置 | ✅ 已完成 |
-| 清理 OpenClaw 遗留代码 | 移除兼容层 | 🔴 待开始 |
+| 清理 OpenClaw 遗留代码 | 移除兼容层 | ✅ 已完成 |
 
 ### Phase 4: 类型系统完善 (P2)
 
@@ -327,8 +327,9 @@ ZCLAW 是基于 **OpenFang** (Rust Agent OS) 的 AI Agent 桌面客户端，核
 
 - [x] 创建 OpenFang config.toml
 - [x] 迁移 OpenClaw JSON 配置到 TOML
-- [ ] 无 OpenClaw JSON 配置文件 (保留 openclaw.default.json 作为参考)
-- [ ] 无 OpenClaw 兼容层代码
+- [x] OpenClaw JSON 配置已归档到 docs/archive/openclaw-legacy/
+- [x] 默认路径从 ~/.openclaw 更新为 ~/.openfang
+- [x] 默认端口从 18789 更新为 50051
 
 ### 6.4 Phase 4 完成标准
 
@@ -383,7 +384,7 @@ ZCLAW 是基于 **OpenFang** (Rust Agent OS) 的 AI Agent 桌面客户端，核
 *文档创建: 2026-03-14*
 *最后更新: 2026-03-15*
 *Phase 1 & 2 已完成*
-*Phase 3 进行中 (2/3)*
+*Phase 3 已完成*
 *Phase 4 已完成*
 *Phase 5 进行中 (9/60+ Skills)*
-*下次审查: Phase 3 完成后*
+*下次审查: Phase 5 扩展*

docs/archive/openclaw-legacy/openclaw.default.json

@@ -0,0 +1,70 @@
+{
+  "_comment": "ZCLAW default OpenClaw configuration",
+  "agents": {
+    "defaults": {
+      "workspace": "~/.openclaw/zclaw-workspace",
+      "model": {
+        "primary": "zhipu/glm-5",
+        "fallbacks": ["openai/gpt-4o", "qwen/qwen3.5-plus"]
+      },
+      "models": {
+        "zhipu/glm-5": { "alias": "GLM-5" },
+        "zhipu/glm-4.7": { "alias": "GLM-4.7" },
+        "qwen/qwen3.5-plus": { "alias": "Qwen3.5+" },
+        "kimi/kimi-k2.5": { "alias": "Kimi-K2.5" },
+        "minimax/minimax-m2.5": { "alias": "MiniMax-M2.5" },
+        "openai/gpt-4o": { "alias": "GPT-4o" }
+      },
+      "heartbeat": {
+        "every": "1h"
+      },
+      "sandbox": {
+        "workspaceRoot": "~/.openclaw/zclaw-workspace"
+      }
+    },
+    "list": [
+      {
+        "id": "main",
+        "groupChat": {
+          "mentionPatterns": ["@zclaw", "zclaw", "小龙虾"]
+        }
+      }
+    ]
+  },
+  "channels": {
+    "feishu": {
+      "enabled": false,
+      "accounts": {
+        "default": {
+          "appId": "",
+          "appSecret": "",
+          "enabled": false
+        }
+      }
+    }
+  },
+  "plugins": {
+    "load": {
+      "paths": [
+        "./plugins/zclaw-chinese-models",
+        "./plugins/zclaw-feishu",
+        "./plugins/zclaw-ui"
+      ]
+    }
+  },
+  "skills": {
+    "load": {
+      "extraDirs": ["./skills"]
+    }
+  },
+  "tools": {
+    "exec": {
+      "shell": true
+    },
+    "web": {
+      "search": {
+        "enabled": true
+      }
+    }
+  }
+}