新增: 初始化 DevFlow 项目仓库

Tauri 2 + Vue 3 + Vite 6 桌面应用，Rust workspace 含 13 个 crate
(df-ai / df-storage / df-workflow / df-core / df-execute 等)。
核心能力：AI 聊天 agentic 循环(工具调用+人工审批)、工作流引擎、
任务/想法/项目/阶段管理、可追溯性，及配套前端组件。

crates/df-nodes/src/script_node.rs

@@ -0,0 +1,94 @@
+//! 脚本节点 — 执行 Shell 脚本或自定义命令
+
+use async_trait::async_trait;
+use df_workflow::node::{Node, NodeContext, NodeOutput, NodeResult, NodeSchema};
+
+/// 脚本节点
+pub struct ScriptNode;
+
+#[async_trait]
+impl Node for ScriptNode {
+    async fn execute(&self, ctx: NodeContext) -> NodeResult {
+        tracing::info!("ScriptNode 执行: {}", ctx.node_id);
+
+        // 从 config 解析 command（必填）
+        let command = ctx
+            .config
+            .get("command")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow::anyhow!("ScriptNode 缺少必填参数: command"))?;
+
+        // 解析可选参数
+        let timeout_secs = ctx
+            .config
+            .get("timeout_secs")
+            .and_then(|v| v.as_u64());
+
+        let working_dir = ctx
+            .config
+            .get("working_dir")
+            .and_then(|v| v.as_str())
+            .map(|s| s.to_string());
+
+        // 构建请求并执行
+        let request = df_execute::shell::ShellRequest {
+            command: command.to_string(),
+            working_dir,
+            env: std::collections::HashMap::new(),
+            timeout_secs,
+        };
+
+        tracing::info!("ScriptNode 执行命令: {}", command);
+        let result = df_execute::shell::execute(request).await?;
+
+        // 非零退出码视为执行失败
+        let exit_code = result.exit_code.unwrap_or(-1);
+        if exit_code != 0 {
+            anyhow::bail!(
+                "脚本执行失败 (exit_code={}): {}",
+                exit_code,
+                result.stderr.trim()
+            );
+        }
+
+        tracing::info!(
+            "ScriptNode 完成: 耗时 {}ms, exit_code={}",
+            result.duration_ms,
+            exit_code
+        );
+
+        Ok(NodeOutput::from_value(serde_json::json!({
+            "stdout": result.stdout,
+            "stderr": result.stderr,
+            "exit_code": exit_code,
+            "duration_ms": result.duration_ms,
+        })))
+    }
+
+    fn schema(&self) -> NodeSchema {
+        NodeSchema {
+            params: serde_json::json!({
+                "type": "object",
+                "properties": {
+                    "command": { "type": "string" },
+                    "timeout_secs": { "type": "integer" },
+                    "working_dir": { "type": "string" }
+                },
+                "required": ["command"]
+            }),
+            output: serde_json::json!({
+                "type": "object",
+                "properties": {
+                    "stdout": { "type": "string" },
+                    "stderr": { "type": "string" },
+                    "exit_code": { "type": "integer" },
+                    "duration_ms": { "type": "integer" }
+                }
+            }),
+        }
+    }
+
+    fn node_type(&self) -> &str {
+        "script"
+    }
+}