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-storage/src/migrations.rs

@@ -0,0 +1,174 @@
+//! 数据库迁移 — 建表 SQL 与版本管理
+
+use anyhow::Result;
+use rusqlite::Connection;
+
+/// 当前迁移版本
+const MIGRATION_VERSION: i32 = 2;
+
+/// 执行所有迁移
+pub fn run(conn: &Connection) -> Result<()> {
+    // 创建迁移版本表
+    conn.execute_batch(
+        "CREATE TABLE IF NOT EXISTS schema_version (
+            version INTEGER PRIMARY KEY
+        );"
+    )?;
+
+    let current_version: i32 = conn
+        .query_row(
+            "SELECT COALESCE(MAX(version), 0) FROM schema_version",
+            [],
+            |row| row.get(0),
+        )
+        .unwrap_or(0);
+
+    if current_version < 1 {
+        migrate_v1(conn)?;
+    }
+
+    if current_version < 2 {
+        migrate_v2(conn)?;
+    }
+
+    // 未来迁移在此扩展：
+    // if current_version < 3 { migrate_v3(conn)?; }
+
+    Ok(())
+}
+
+/// V1: 初始表结构
+fn migrate_v1(conn: &Connection) -> Result<()> {
+    conn.execute_batch(V1_SQL)?;
+    conn.execute("INSERT INTO schema_version (version) VALUES (?)", [1])?;
+    tracing::info!("迁移 v1 完成");
+    Ok(())
+}
+
+/// V2: 补齐关联字段 + branches 表
+fn migrate_v2(conn: &Connection) -> Result<()> {
+    conn.execute_batch(V2_SQL)?;
+    conn.execute("INSERT INTO schema_version (version) VALUES (?)", [2])?;
+    tracing::info!("迁移 v2 完成");
+    Ok(())
+}
+
+/// V1 建表 SQL
+const V1_SQL: &str = "
+-- 想法表
+CREATE TABLE IF NOT EXISTS ideas (
+    id          TEXT PRIMARY KEY,
+    title       TEXT NOT NULL,
+    description TEXT NOT NULL DEFAULT '',
+    status      TEXT NOT NULL DEFAULT 'draft',
+    priority    INTEGER NOT NULL DEFAULT 1,
+    score       REAL,
+    tags        TEXT,
+    source      TEXT,
+    created_at  TEXT NOT NULL,
+    updated_at  TEXT NOT NULL
+);
+
+-- 项目表
+CREATE TABLE IF NOT EXISTS projects (
+    id          TEXT PRIMARY KEY,
+    name        TEXT NOT NULL,
+    description TEXT NOT NULL DEFAULT '',
+    status      TEXT NOT NULL DEFAULT 'planning',
+    idea_id     TEXT REFERENCES ideas(id),
+    created_at  TEXT NOT NULL,
+    updated_at  TEXT NOT NULL
+);
+
+-- 任务表
+CREATE TABLE IF NOT EXISTS tasks (
+    id          TEXT PRIMARY KEY,
+    project_id  TEXT NOT NULL REFERENCES projects(id),
+    title       TEXT NOT NULL,
+    description TEXT NOT NULL DEFAULT '',
+    status      TEXT NOT NULL DEFAULT 'todo',
+    priority    INTEGER NOT NULL DEFAULT 1,
+    branch_name TEXT,
+    assignee    TEXT,
+    created_at  TEXT NOT NULL,
+    updated_at  TEXT NOT NULL
+);
+
+-- 发布表
+CREATE TABLE IF NOT EXISTS releases (
+    id          TEXT PRIMARY KEY,
+    project_id  TEXT NOT NULL REFERENCES projects(id),
+    version     TEXT NOT NULL,
+    status      TEXT NOT NULL DEFAULT 'planned',
+    task_ids    TEXT NOT NULL DEFAULT '[]',
+    changelog   TEXT,
+    created_at  TEXT NOT NULL,
+    released_at TEXT
+);
+
+-- 工作流执行表
+CREATE TABLE IF NOT EXISTS workflow_executions (
+    id            TEXT PRIMARY KEY,
+    name          TEXT NOT NULL,
+    dag_json      TEXT NOT NULL,
+    status        TEXT NOT NULL DEFAULT 'pending',
+    triggered_by  TEXT,
+    created_at    TEXT NOT NULL,
+    completed_at  TEXT
+);
+
+-- 节点执行表
+CREATE TABLE IF NOT EXISTS node_executions (
+    id            TEXT PRIMARY KEY,
+    workflow_id   TEXT NOT NULL REFERENCES workflow_executions(id),
+    node_id       TEXT NOT NULL,
+    node_type     TEXT NOT NULL,
+    status        TEXT NOT NULL DEFAULT 'pending',
+    input_json    TEXT,
+    output_json   TEXT,
+    error_message TEXT,
+    started_at    TEXT,
+    completed_at  TEXT
+);
+
+-- 索引
+CREATE INDEX IF NOT EXISTS idx_tasks_project_id ON tasks(project_id);
+CREATE INDEX IF NOT EXISTS idx_tasks_status ON tasks(status);
+CREATE INDEX IF NOT EXISTS idx_releases_project_id ON releases(project_id);
+CREATE INDEX IF NOT EXISTS idx_node_executions_workflow_id ON node_executions(workflow_id);
+";
+
+/// V2 迁移 SQL — 补齐数据层断裂字段
+///
+/// 注意: SQLite 的 ALTER TABLE ADD COLUMN 一条语句只能加一列。
+const V2_SQL: &str = "
+-- 想法表: 晋升关联 + AI 分析 + 多维评分
+ALTER TABLE ideas ADD COLUMN promoted_to TEXT;
+ALTER TABLE ideas ADD COLUMN ai_analysis TEXT;
+ALTER TABLE ideas ADD COLUMN scores TEXT;
+
+-- 任务表: 工作流定义关联 + 基础分支
+ALTER TABLE tasks ADD COLUMN workflow_def_id TEXT;
+ALTER TABLE tasks ADD COLUMN base_branch TEXT;
+
+-- 工作流执行表: 项目 / 任务关联
+ALTER TABLE workflow_executions ADD COLUMN project_id TEXT;
+ALTER TABLE workflow_executions ADD COLUMN task_id TEXT;
+
+-- 分支表 — 任务与 Git 分支绑定（核心功能）
+CREATE TABLE IF NOT EXISTS branches (
+    id          TEXT PRIMARY KEY,
+    project_id  TEXT NOT NULL REFERENCES projects(id),
+    task_id     TEXT REFERENCES tasks(id),
+    name        TEXT NOT NULL,
+    base        TEXT NOT NULL DEFAULT 'main',
+    status      TEXT NOT NULL DEFAULT 'active',
+    created_at  TEXT NOT NULL,
+    updated_at  TEXT NOT NULL,
+    merged_at   TEXT
+);
+
+-- 索引
+CREATE INDEX IF NOT EXISTS idx_branches_project_id ON branches(project_id);
+CREATE INDEX IF NOT EXISTS idx_branches_task_id ON branches(task_id);
+";