refactor: 统一项目名称从OpenFang到ZCLAW

重构所有代码和文档中的项目名称，将OpenFang统一更新为ZCLAW。包括：
- 配置文件中的项目名称
- 代码注释和文档引用
- 环境变量和路径
- 类型定义和接口名称
- 测试用例和模拟数据

同时优化部分代码结构，移除未使用的模块，并更新相关依赖项。

config/config.toml

@@ -1,10 +1,10 @@
 # ============================================================
-# ZClaw OpenFang Main Configuration
-# OpenFang TOML format configuration file
+# ZCLAW Main Configuration
+# ZCLAW TOML format configuration file
 # ============================================================
 #
 # Usage:
-# 1. Copy this file to ~/.openfang/config.toml
+# 1. Copy this file to ~/.zclaw/config.toml
 # 2. Set environment variables for API keys
 # 3. Import chinese-providers.toml for Chinese LLM support
 #
@@ -38,7 +38,7 @@ api_version = "v1"
 
 [agent.defaults]
 # Default workspace for agent operations
-workspace = "~/.openfang/zclaw-workspace"
+workspace = "~/.zclaw/zclaw-workspace"
 
 # Default model for new sessions
 default_model = "zhipu/glm-4-plus"
@@ -57,7 +57,7 @@ max_sessions = 10
 
 [agent.defaults.sandbox]
 # Sandbox root directory
-workspace_root = "~/.openfang/zclaw-workspace"
+workspace_root = "~/.zclaw/zclaw-workspace"
 
 # Allowed shell commands (empty = all allowed)
 # allowed_commands = ["git", "npm", "pnpm", "cargo"]
@@ -104,7 +104,7 @@ execution_timeout = "30m"
 
 # Audit settings
 audit_enabled = true
-audit_log_path = "~/.openfang/logs/hands-audit.log"
+audit_log_path = "~/.zclaw/logs/hands-audit.log"
 
 # ============================================================
 # LLM Provider Configuration
@@ -166,7 +166,7 @@ burst_size = 20
 # Audit logging
 [security.audit]
 enabled = true
-log_path = "~/.openfang/logs/audit.log"
+log_path = "~/.zclaw/logs/audit.log"
 log_format = "json"
 
 # ============================================================
@@ -183,7 +183,7 @@ format = "pretty"
 # Log file settings
 [logging.file]
 enabled = true
-path = "~/.openfang/logs/openfang.log"
+path = "~/.zclaw/logs/zclaw.log"
 max_size = "10MB"
 max_files = 5
 compress = true
@@ -228,7 +228,7 @@ max_results = 10
 
 # File system tool
 [tools.fs]
-allowed_paths = ["~/.openfang/zclaw-workspace"]
+allowed_paths = ["~/.zclaw/zclaw-workspace"]
 max_file_size = "10MB"
 
 # ============================================================
@@ -237,7 +237,7 @@ max_file_size = "10MB"
 
 [workflow]
 # Workflow storage
-storage_path = "~/.openfang/workflows"
+storage_path = "~/.zclaw/workflows"
 
 # Execution settings
 max_steps = 100