chore: 干净 ERP 基座 — 删除 health/ai/wechat 业务代码

删除内容:
- 前端: health/(67文件), ai/(2文件), Copilot, MediaPicker, 相关API/Store/Hook
- 后端: wechat_handler, wechat_service, wechat_user entity, analytics handler, ai_workflow_seed
- 配置: WechatConfig, AppConfig.wechat, AuthState wechat 字段
- 启动: 微信凭据检查块, ensure_ai_workflows() 调用
- 迁移: 新增 m20260613_000170_drop_wechat_users.rs
- 脚本: api_test_health_alert.py, api_test_mp.py, mpsync.sh/ps1
- E2E: health-data page, flows/ 目录

保留: erp-core/auth/workflow/message/config/plugin + 基座前端 + 通用组件

crates/erp-server/migration/src/m20260411_000002_create_users.rs

@@ -0,0 +1,104 @@
+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> {
+        manager
+            .create_table(
+                Table::create()
+                    .table(Users::Table)
+                    .if_not_exists()
+                    .col(ColumnDef::new(Users::Id).uuid().not_null().primary_key())
+                    .col(ColumnDef::new(Users::TenantId).uuid().not_null())
+                    .col(ColumnDef::new(Users::Username).string().not_null())
+                    .col(ColumnDef::new(Users::Email).string().null())
+                    .col(ColumnDef::new(Users::Phone).string().null())
+                    .col(ColumnDef::new(Users::DisplayName).string().null())
+                    .col(ColumnDef::new(Users::AvatarUrl).string().null())
+                    .col(
+                        ColumnDef::new(Users::Status)
+                            .string()
+                            .not_null()
+                            .default("active"),
+                    )
+                    .col(
+                        ColumnDef::new(Users::LastLoginAt)
+                            .timestamp_with_time_zone()
+                            .null(),
+                    )
+                    .col(
+                        ColumnDef::new(Users::CreatedAt)
+                            .timestamp_with_time_zone()
+                            .not_null()
+                            .default(Expr::current_timestamp()),
+                    )
+                    .col(
+                        ColumnDef::new(Users::UpdatedAt)
+                            .timestamp_with_time_zone()
+                            .not_null()
+                            .default(Expr::current_timestamp()),
+                    )
+                    .col(ColumnDef::new(Users::CreatedBy).uuid().not_null())
+                    .col(ColumnDef::new(Users::UpdatedBy).uuid().not_null())
+                    .col(
+                        ColumnDef::new(Users::DeletedAt)
+                            .timestamp_with_time_zone()
+                            .null(),
+                    )
+                    .col(
+                        ColumnDef::new(Users::Version)
+                            .integer()
+                            .not_null()
+                            .default(1),
+                    )
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_users_tenant_id")
+                    .table(Users::Table)
+                    .col(Users::TenantId)
+                    .to_owned(),
+            )
+            .await?;
+
+        manager.get_connection().execute(sea_orm::Statement::from_string(
+            sea_orm::DatabaseBackend::Postgres,
+            "CREATE UNIQUE INDEX idx_users_tenant_username ON users (tenant_id, username) WHERE deleted_at IS NULL".to_string(),
+        )).await.map_err(|e| DbErr::Custom(e.to_string()))?;
+
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_table(Table::drop().table(Users::Table).to_owned())
+            .await
+    }
+}
+
+#[derive(DeriveIden)]
+enum Users {
+    Table,
+    Id,
+    TenantId,
+    Username,
+    Email,
+    Phone,
+    DisplayName,
+    AvatarUrl,
+    Status,
+    LastLoginAt,
+    CreatedAt,
+    UpdatedAt,
+    CreatedBy,
+    UpdatedBy,
+    DeletedAt,
+    Version,
+}