feat(industry): Phase 1 行业配置基础 — 数据模型 + 四行业内置配置 + ButlerRouter 动态关键词

- 新增 SaaS industry 模块 (types/service/handlers/mod/builtin)
- 4 行业内置配置: healthcare/education/garment/ecommerce
- 数据库迁移: industries + account_industries 表
- 8 个 API 端点 (CRUD + 用户行业关联)
- ButlerRouter 改造: 支持 IndustryKeywordConfig 动态注入
- 12 个测试全通过 (含动态行业分类测试)

crates/zclaw-saas/src/main.rs

@@ -349,6 +349,7 @@ async fn build_router(state: AppState) -> axum::Router {
         .merge(zclaw_saas::telemetry::routes())
         .merge(zclaw_saas::billing::routes())
         .merge(zclaw_saas::knowledge::routes())
+        .merge(zclaw_saas::industry::routes())
         .layer(middleware::from_fn_with_state(
             state.clone(),
             zclaw_saas::middleware::api_version_middleware,