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。

src-tauri/src/lib.rs

@@ -0,0 +1,70 @@
+//! DevFlow Tauri 入口 — 初始化 AppState 并注册全部 IPC 命令
+
+mod commands;
+mod state;
+
+use tauri::Manager;
+
+use state::AppState;
+
+#[tauri::command]
+fn greet(name: &str) -> String {
+    format!("Hello, {}! Welcome to DevFlow.", name)
+}
+
+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+    tauri::Builder::default()
+        .plugin(tauri_plugin_opener::init())
+        .setup(|app| {
+            // 数据库放在系统应用数据目录下：<app_data_dir>/devflow.db
+            let data_dir = app.path().app_data_dir()?;
+            std::fs::create_dir_all(&data_dir)?;
+            let db_path = data_dir.join("devflow.db");
+
+            // 初始化全局状态（打开数据库 + 执行迁移）
+            let app_state = tauri::async_runtime::block_on(AppState::init(&db_path))?;
+            app.manage(app_state);
+            Ok(())
+        })
+        .invoke_handler(tauri::generate_handler![
+            greet,
+            // 项目
+            commands::project::list_projects,
+            commands::project::create_project,
+            commands::project::get_project,
+            commands::project::update_project,
+            commands::project::delete_project,
+            // 任务
+            commands::task::list_tasks,
+            commands::task::create_task,
+            commands::task::update_task,
+            commands::task::delete_task,
+            // 想法
+            commands::idea::list_ideas,
+            commands::idea::create_idea,
+            commands::idea::update_idea,
+            commands::idea::delete_idea,
+            // 工作流
+            commands::workflow::run_workflow,
+            commands::workflow::list_workflow_executions,
+            commands::workflow::get_workflow_execution,
+            commands::workflow::approve_human_approval,
+            // AI 聊天
+            commands::ai::ai_chat_send,
+            commands::ai::ai_chat_stop,
+            commands::ai::ai_approve,
+            commands::ai::ai_chat_clear,
+            commands::ai::ai_list_providers,
+            commands::ai::ai_save_provider,
+            commands::ai::ai_set_provider,
+            // AI 对话管理
+            commands::ai::ai_conversation_create,
+            commands::ai::ai_conversation_list,
+            commands::ai::ai_conversation_switch,
+            commands::ai::ai_conversation_delete,
+            commands::ai::ai_conversation_rename,
+        ])
+        .run(tauri::generate_context!())
+        .expect("error while running tauri application");
+}