feat(flows): 新增流程编辑器基础功能与相关组件

feat(backend): 添加流程模型与服务支持
feat(frontend): 实现流程编辑器UI与交互
feat(assets): 添加流程节点图标资源
feat(plugins): 实现上下文菜单和运行时插件
feat(components): 新增基础节点和侧边栏组件
feat(routes): 添加流程相关路由配置
feat(models): 创建流程和运行日志数据模型
feat(services): 实现流程服务层逻辑
feat(migration): 添加流程相关数据库迁移
feat(config): 更新前端配置支持流程编辑器
feat(utils): 增强axios错误处理和工具函数

backend/src/flow/context.rs

@@ -0,0 +1,27 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct FlowContext {
+    #[serde(default)]
+    pub data: serde_json::Value,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub enum ExecutionMode {
+    #[serde(rename = "sync")] Sync,
+    #[serde(rename = "async")] AsyncFireAndForget,
+}
+
+impl Default for ExecutionMode { fn default() -> Self { ExecutionMode::Sync } }
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DriveOptions {
+    #[serde(default)]
+    pub max_steps: usize,
+    #[serde(default)]
+    pub execution_mode: ExecutionMode,
+}
+
+impl Default for DriveOptions {
+    fn default() -> Self { Self { max_steps: 10_000, execution_mode: ExecutionMode::Sync } }
+}