feat: pipeline templates, analytics opt-out, 83 conversion presets, positioning + e2e modernization

Lands five integrated branches: pipeline templates (#355), analytics opt-out (#354), 83 conversion presets bringing the catalog to 240 tools (#356), self-hosted positioning (#353), and e2e modernization (#351).

Integration fixes: aligned stale web analytics tests with the opt-out/allow-list model, closed 3 CodeQL incomplete-sanitization alerts in the i18n generator, resolved settings/index/docs/format-matrix conflicts, and corrected tool counts to 240.

apps/demo/src/mock-api.ts

@@ -155,22 +155,27 @@ function matchRoute(url: string, method: string): Response | null {
         enableExperimentalTools: "false",
         defaultToolView: "sidebar",
         defaultTheme: "system",
+        analyticsEnabled: "false",
       },
     });
   }
 
+  if (path === "/api/v1/settings" && method === "PUT") {
+    return json({ ok: true, updatedCount: 0 });
+  }
+
   if (path === "/api/v1/features" && method === "GET") {
     return json({ bundles: FEATURE_BUNDLES });
   }
 
   if (path === "/api/v1/config/analytics" && method === "GET") {
     return json({
-      enabled: true,
+      enabled: false,
       posthogApiKey: "",
       posthogHost: "",
       sentryDsn: "",
       sampleRate: 0,
-      instanceId: "demo-instance",
+      instanceId: "",
     });
   }