feat(ai): 添加 ai_tenant_configs 迁移 + Entity

支持租户级 Provider 路由配置、月度 Token 预算、每日患者限制
unique 索引确保每租户一条配置，迁移号 000117

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

@@ -0,0 +1,27 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "ai_tenant_configs")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub default_provider: String,
+    pub fallback_provider: Option<String>,
+    pub analysis_type_overrides: Option<Json>,
+    pub monthly_token_budget: i64,
+    pub daily_patient_limit: i32,
+    pub is_enabled: bool,
+    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 {}

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

@@ -2,4 +2,5 @@ pub mod ai_analysis;
 pub mod ai_prompt;
 pub mod ai_risk_threshold;
 pub mod ai_suggestion;
+pub mod ai_tenant_config;
 pub mod ai_usage;