fix(saas): industry template audit fixes + pgvector optional + relay timeout

- Fix seed template tools to match actual runtime tool names
  (file_read/file_write/shell_exec/web_fetch)
- Persist system_prompt/temperature/max_tokens via identity system
  in agentStore.createFromTemplate()
- Fire-and-forget assignTemplate() in AgentOnboardingWizard
- Fix saas-relay-client unused variable warning
- Make pgvector extension optional in knowledge_base migration
- Increase StreamBridge timeout from 30s to 90s for thinking models

desktop/src/lib/saas-relay-client.ts

@@ -157,6 +157,16 @@ export function createSaaSRelayGatewayClient(
 
           try {
             const parsed = JSON.parse(data);
+
+            // Handle SSE error events from relay (e.g. stream_timeout)
+            if (parsed.error) {
+              const errMsg = parsed.message || parsed.error || 'Unknown stream error';
+              log.warn('SSE stream error:', errMsg);
+              callbacks.onError(errMsg);
+              callbacks.onComplete();
+              return { runId };
+            }
+
             const choices = parsed.choices?.[0];
             if (!choices) continue;