feat(ai): Copilot 基因化 Phase 0 Task 1-4 — 迁移 + Entity + 规则引擎

- 4 表迁移: copilot_rules, copilot_insights, copilot_risk_snapshots, copilot_chat_logs
- 4 个 SeaORM Entity 对应新表
- JSONLogic 规则引擎 (evaluate + evaluate_rules) + 5 个单元测试

crates/erp-ai/src/entity/copilot_rules.rs

@@ -0,0 +1,29 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "copilot_rules")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub name: String,
+    pub category: String,
+    pub condition_expr: serde_json::Value,
+    pub score: i16,
+    pub severity: String,
+    pub suggestion: Option<String>,
+    pub enabled: bool,
+    pub sort_order: i32,
+    pub created_at: DateTimeUtc,
+    pub updated_at: DateTimeUtc,
+    pub created_by: Option<Uuid>,
+    pub updated_by: Option<Uuid>,
+    pub deleted_at: Option<DateTimeUtc>,
+    pub version_lock: i32,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}