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-ideas/src/scoring.rs

@@ -0,0 +1,75 @@
+//! 评分引擎 — 多维度加权评分
+
+use crate::capture::Idea;
+
+/// 想法评分详情（重新导出 capture 模块中的定义）
+pub use crate::capture::IdeaScores;
+
+/// 评分权重配置
+#[derive(Debug, Clone)]
+pub struct ScoringWeights {
+    pub feasibility: f64,
+    pub impact: f64,
+    pub urgency: f64,
+}
+
+impl Default for ScoringWeights {
+    fn default() -> Self {
+        Self {
+            feasibility: 0.4,
+            impact: 0.4,
+            urgency: 0.2,
+        }
+    }
+}
+
+/// 评分引擎
+pub struct ScoringEngine;
+
+impl ScoringEngine {
+    /// 使用默认权重计算评分
+    ///
+    /// TODO: 接入 AI 进行深度评分，当前返回基于启发式的分数
+    pub fn compute_default(idea: &Idea) -> IdeaScores {
+        let weights = ScoringWeights::default();
+        Self::compute(idea, &weights)
+    }
+
+    /// 使用指定权重计算评分
+    pub fn compute(idea: &Idea, weights: &ScoringWeights) -> IdeaScores {
+        // TODO: 基于想法内容、历史数据、AI 分析等多维度评分
+        // 当前使用基于启发式的占位评分
+        let feasibility = Self::heuristic_feasibility(idea);
+        let impact = Self::heuristic_impact(idea);
+        let urgency = Self::heuristic_urgency(idea);
+
+        let overall = feasibility * weights.feasibility
+            + impact * weights.impact
+            + urgency * weights.urgency;
+
+        IdeaScores {
+            feasibility,
+            impact,
+            urgency,
+            overall,
+        }
+    }
+
+    /// 启发式可行性评分
+    fn heuristic_feasibility(_idea: &Idea) -> f64 {
+        // TODO: 基于描述复杂度、资源需求等评估
+        5.0
+    }
+
+    /// 启发式影响力评分
+    fn heuristic_impact(_idea: &Idea) -> f64 {
+        // TODO: 基于业务价值、用户影响等评估
+        5.0
+    }
+
+    /// 启发式紧急度评分
+    fn heuristic_urgency(_idea: &Idea) -> f64 {
+        // TODO: 基于优先级、时间窗口等评估
+        5.0
+    }
+}