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.

tests/integration/tool-route-drift.test.ts

@@ -40,6 +40,21 @@ const REGISTRY_EXEMPT = new Set([
   "svg-to-raster",
   "transcribe-audio",
   "watermark-image",
+  // Conversion presets riding the three custom ZIP routes above (image-to-pdf,
+  // pdf-to-image, svg-to-raster). They share those routes' contracts, so like
+  // their bases they are not in the process-fn registry.
+  "jpg-to-pdf",
+  "png-to-pdf",
+  "heic-to-pdf",
+  "tiff-to-pdf",
+  "webp-to-pdf",
+  "gif-to-pdf",
+  "eps-to-pdf",
+  "pdf-to-jpg",
+  "pdf-to-png",
+  "pdf-to-tiff",
+  "svg-to-png",
+  "svg-to-jpg",
 ]);
 
 const LEGACY_ALIASES = new Set([