feat(saas): industry agent template assignment system

Phase 1-8 of industry-agent-delivery plan:

- DB migration: accounts.assigned_template_id (ON DELETE SET NULL)
- SaaS API: 4 new endpoints (assign/get/unassign/create-agent)
- Service layer: assign_template_to_account, get_assigned_template, unassign_template, create_agent_from_template)
- Types: AssignTemplateRequest, AgentConfigFromTemplate (capabilities merged into tools)
- Frontend SaaS Client: assignTemplate, getAssignedTemplate, unassignTemplate, createAgentFromTemplate
- saasStore: assignedTemplate state + login auto-fetch + actions
- saas-relay-client: fix unused import and saasUrl reference error
- connectionStore: fix relayModel undefined error
- capabilities default to glm-4-flash

- Route registration: new template assignment routes

Cospec and handlers consolidated

Build: cargo check --workspace PASS, tsc --noEmit Pass

crates/zclaw-saas/src/agent_template/mod.rs

@@ -10,10 +10,16 @@ use crate::state::AppState;
 /// Agent 模板管理路由 (需要认证)
 pub fn routes() -> axum::Router<AppState> {
     axum::Router::new()
+        // Template CRUD
         .route("/api/v1/agent-templates", get(handlers::list_templates).post(handlers::create_template))
         .route("/api/v1/agent-templates/available", get(handlers::list_available))
         .route("/api/v1/agent-templates/:id", get(handlers::get_template))
         .route("/api/v1/agent-templates/:id", post(handlers::update_template))
         .route("/api/v1/agent-templates/:id", delete(handlers::archive_template))
         .route("/api/v1/agent-templates/:id/full", get(handlers::get_full_template))
+        .route("/api/v1/agent-templates/:id/create-agent", post(handlers::create_agent_from_template))
+        // Template Assignment (per-account)
+        .route("/api/v1/accounts/me/assign-template", post(handlers::assign_template))
+        .route("/api/v1/accounts/me/assigned-template", get(handlers::get_assigned_template))
+        .route("/api/v1/accounts/me/assigned-template", delete(handlers::unassign_template))
 }