fix(ai): AI 对话全链路修复 + 菜单配置 + 会话消息持久化

- 修复 ai_tenant_config Entity 表名错误（复数→单数）导致 budget_status 500
- 修复 ai_usage 表 SQL 引用不存在的 deleted_at 列
- 修复 risk_service SQL 列名/表名与实际数据库 schema 不匹配
- chat_handler provider 选择改为配置优先（default_provider→fallback chain）
- 新增 Ollama 非 FC provider 的 generate() 降级路径
- 新增 GET /ai/chat/sessions/{id}/messages 端点
- 前端 ChatPage 切换会话时从后端加载历史消息
- AiConfigPage 新增 default_provider 和 system_prompt 配置字段
- 迁移 000155-000156：AI 菜单调整 + AI 客服菜单 + 角色绑定
- 配额检查错误处理区分配额耗尽和 DB 异常

crates/erp-server/migration/src/lib.rs

@@ -156,6 +156,8 @@ mod m20260518_000151_fix_ai_config_menu_parent;
 mod m20260518_000152_seed_ai_provider_permission;
 mod m20260518_000153_ai_health_butler_v2;
 mod m20260519_000154_seed_ai_knowledge_permissions;
+mod m20260519_000155_fix_ai_menus_and_add_chat;
+mod m20260519_000156_fix_ai_menus_round2;
 
 pub struct Migrator;
 
@@ -319,6 +321,8 @@ impl MigratorTrait for Migrator {
             Box::new(m20260518_000152_seed_ai_provider_permission::Migration),
             Box::new(m20260518_000153_ai_health_butler_v2::Migration),
             Box::new(m20260519_000154_seed_ai_knowledge_permissions::Migration),
+            Box::new(m20260519_000155_fix_ai_menus_and_add_chat::Migration),
+            Box::new(m20260519_000156_fix_ai_menus_round2::Migration),
         ]
     }
 }

crates/erp-server/migration/src/m20260519_000155_fix_ai_menus_and_add_chat.rs

@@ -0,0 +1,68 @@
+//! 修复 AI 知识库菜单层级 + 新增 AI 客服菜单
+
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        let db = manager.get_connection();
+        let sys = "00000000-0000-0000-0000-000000000000";
+
+        // 1. 修复 AI 知识库：从 AI 配置子级移到 AI 分析分组下（与 AI 配置同级）
+        // 必须递增 version 以通过乐观锁触发器
+        db.execute_unprepared(
+            r#"
+            UPDATE menus mk
+            SET parent_id = mp.parent_id, version = mk.version + 1
+            FROM menus mp
+            WHERE mp.path = '/health/ai-config' AND mp.deleted_at IS NULL
+              AND mk.path = '/health/ai-knowledge' AND mk.deleted_at IS NULL
+              AND mk.parent_id = mp.id
+            "#,
+        )
+        .await?;
+
+        // 2. 新增 AI 客服菜单（与 AI 配置、AI 知识库同级）
+        db.execute_unprepared(&format!(
+            r#"
+            INSERT INTO menus (id, tenant_id, parent_id, title, path, icon, sort_order,
+                               permission, menu_type, visible,
+                               created_at, updated_at, created_by, updated_by, deleted_at, version)
+            SELECT gen_random_uuid(), t.id,
+                   (SELECT m.parent_id FROM menus m WHERE m.path = '/health/ai-config' AND m.tenant_id = t.id AND m.deleted_at IS NULL LIMIT 1),
+                   'AI 客服', '/ai/chat', 'MessageOutlined', 58,
+                   'ai.chat.session.list', 'menu', true,
+                   NOW(), NOW(), '{sys}', '{sys}', NULL, 1
+            FROM tenant t
+            WHERE NOT EXISTS (
+                SELECT 1 FROM menus m
+                WHERE m.path = '/ai/chat' AND m.tenant_id = t.id AND m.deleted_at IS NULL
+            )
+            "#
+        )).await?;
+
+        // 3. 菜单绑定 admin 角色
+        db.execute_unprepared(&format!(
+            r#"
+            INSERT INTO menu_roles (id, menu_id, role_id, tenant_id, created_at, updated_at, created_by, updated_by, deleted_at, version)
+            SELECT gen_random_uuid(), m.id, r.id, m.tenant_id, NOW(), NOW(), '{sys}', '{sys}', NULL, 1
+            FROM menus m
+            JOIN roles r ON r.tenant_id = m.tenant_id AND r.code = 'admin' AND r.deleted_at IS NULL
+            WHERE m.path = '/ai/chat' AND m.deleted_at IS NULL
+              AND NOT EXISTS (
+                  SELECT 1 FROM menu_roles mr
+                  WHERE mr.menu_id = m.id AND mr.role_id = r.id AND mr.deleted_at IS NULL
+              )
+            "#
+        )).await?;
+
+        Ok(())
+    }
+
+    async fn down(&self, _manager: &SchemaManager) -> Result<(), DbErr> {
+        Ok(())
+    }
+}

crates/erp-server/migration/src/m20260519_000156_fix_ai_menus_round2.rs

@@ -0,0 +1,85 @@
+//! 修复 AI 知识库菜单层级 + 新增 AI 客服菜单（补充 000155 未生效的部分）
+
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        let db = manager.get_connection();
+        let sys = "00000000-0000-0000-0000-000000000000";
+
+        // 1. 修复 AI 知识库：从 AI 配置子级移到 AI 分析分组下（与 AI 配置同级）
+        // 递增 version 以通过乐观锁触发器
+        db.execute_unprepared(
+            r#"
+            UPDATE menus mk
+            SET parent_id = mp.parent_id, version = mk.version + 1
+            FROM menus mp
+            WHERE mp.path = '/health/ai-config' AND mp.deleted_at IS NULL
+              AND mk.path = '/health/ai-knowledge' AND mk.deleted_at IS NULL
+              AND mk.parent_id = mp.id
+            "#,
+        )
+        .await?;
+
+        // 2. 新增 AI 客服菜单（与 AI 配置同级）
+        db.execute_unprepared(&format!(
+            r#"
+            INSERT INTO menus (id, tenant_id, parent_id, title, path, icon, sort_order,
+                               permission, menu_type, visible,
+                               created_at, updated_at, created_by, updated_by, deleted_at, version)
+            SELECT gen_random_uuid(), t.id,
+                   (SELECT m.parent_id FROM menus m WHERE m.path = '/health/ai-config' AND m.tenant_id = t.id AND m.deleted_at IS NULL LIMIT 1),
+                   'AI 客服', '/ai/chat', 'MessageOutlined', 58,
+                   'ai.chat.session.list', 'menu', true,
+                   NOW(), NOW(), '{sys}', '{sys}', NULL, 1
+            FROM tenant t
+            WHERE NOT EXISTS (
+                SELECT 1 FROM menus m
+                WHERE m.path = '/ai/chat' AND m.tenant_id = t.id AND m.deleted_at IS NULL
+            )
+            "#
+        )).await?;
+
+        // 3. 菜单绑定 admin 角色
+        db.execute_unprepared(&format!(
+            r#"
+            INSERT INTO menu_roles (id, menu_id, role_id, tenant_id, created_at, updated_at, created_by, updated_by, deleted_at, version)
+            SELECT gen_random_uuid(), m.id, r.id, m.tenant_id, NOW(), NOW(), '{sys}', '{sys}', NULL, 1
+            FROM menus m
+            JOIN roles r ON r.tenant_id = m.tenant_id AND r.code = 'admin' AND r.deleted_at IS NULL
+            WHERE m.path = '/ai/chat' AND m.deleted_at IS NULL
+              AND NOT EXISTS (
+                  SELECT 1 FROM menu_roles mr
+                  WHERE mr.menu_id = m.id AND mr.role_id = r.id AND mr.deleted_at IS NULL
+              )
+            "#
+        )).await?;
+
+        // 4. 为 doctor / health_manager 角色也绑定 AI 客服菜单
+        for role in ["doctor", "health_manager"] {
+            db.execute_unprepared(&format!(
+                r#"
+                INSERT INTO menu_roles (id, menu_id, role_id, tenant_id, created_at, updated_at, created_by, updated_by, deleted_at, version)
+                SELECT gen_random_uuid(), m.id, r.id, m.tenant_id, NOW(), NOW(), '{sys}', '{sys}', NULL, 1
+                FROM menus m
+                JOIN roles r ON r.tenant_id = m.tenant_id AND r.code = '{role}' AND r.deleted_at IS NULL
+                WHERE m.path = '/ai/chat' AND m.deleted_at IS NULL
+                  AND NOT EXISTS (
+                      SELECT 1 FROM menu_roles mr
+                      WHERE mr.menu_id = m.id AND mr.role_id = r.id AND mr.deleted_at IS NULL
+                  )
+                "#
+            )).await?;
+        }
+
+        Ok(())
+    }
+
+    async fn down(&self, _manager: &SchemaManager) -> Result<(), DbErr> {
+        Ok(())
+    }
+}