feat(ai): AI 健康管家 V2 基础设施 — 功能开关 + 角色沙箱准备 + 体征页 AI 趋势分析

- 迁移 000153: 新增 ai_feature_flags / ai_usage_daily / ai_suggestion_feedback 三张表,
  ai_tenant_configs 增加 billing_enabled 列, seed 12 个功能开关 + 2 个管理权限码
- 新增 FeatureFlagService: 5 分钟缓存 + DB 回退 + 即时更新
- VitalSignsTab 添加 AI 趋势分析按钮 (SSE 流式)
- 新增 3 个 Entity (ai_feature_flags / ai_usage_daily / ai_suggestion_feedback)
- AiState 扩展 feature_flags 字段
- 设计规格 + 讨论记录文档

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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

@@ -0,0 +1,20 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "ai_feature_flags")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub feature: String,
+    pub is_enabled: bool,
+    pub config: Option<Json>,
+    pub updated_at: DateTimeUtc,
+    pub updated_by: Option<Uuid>,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}

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

@@ -0,0 +1,20 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "ai_suggestion_feedback")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub suggestion_id: Uuid,
+    pub user_id: Uuid,
+    pub action: String,
+    pub feedback_text: Option<String>,
+    pub created_at: DateTimeUtc,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}

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

@@ -0,0 +1,24 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "ai_usage_daily")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub date: chrono::NaiveDate,
+    pub feature: String,
+    pub provider: String,
+    pub model: String,
+    pub total_calls: i32,
+    pub total_input_tokens: i64,
+    pub total_output_tokens: i64,
+    pub total_cost_cents: i64,
+    pub created_at: DateTimeUtc,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}

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

@@ -1,13 +1,16 @@
 pub mod ai_analysis;
 pub mod ai_analysis_queue;
+pub mod ai_feature_flags;
 pub mod ai_knowledge_guides;
 pub mod ai_knowledge_references;
 pub mod ai_knowledge_rules;
 pub mod ai_prompt;
 pub mod ai_risk_threshold;
 pub mod ai_suggestion;
+pub mod ai_suggestion_feedback;
 pub mod ai_tenant_config;
 pub mod ai_usage;
+pub mod ai_usage_daily;
 pub mod copilot_chat_logs;
 pub mod copilot_insights;
 pub mod copilot_risk_snapshots;