feat(kilo-docs): add PostHog reverse proxy via Next.js rewrites

packages/kilo-docs/.env.docs.sample

@@ -3,4 +3,4 @@ NEXT_PUBLIC_ALGOLIA_API_KEY=zyz6789
 NEXT_PUBLIC_ALGOLIA_INDEX_NAME="Kilo Code Docs"
 NEXT_PUBLIC_ALGOLIA_ASSISTANT_ID=foo-bar
 NEXT_PUBLIC_POSTHOG_KEY=phc_QWERTY
-NEXT_PUBLIC_POSTHOG_HOST=https://us.i.posthog.com
+# NEXT_PUBLIC_POSTHOG_HOST=https://us.i.posthog.com  # no longer needed; proxy via /ingest rewrites

packages/kilo-docs/instrumentation-client.ts

@@ -2,7 +2,8 @@ import posthog from "posthog-js"
 
 if (process.env.NEXT_PUBLIC_POSTHOG_KEY) {
   posthog.init(process.env.NEXT_PUBLIC_POSTHOG_KEY, {
-    api_host: process.env.NEXT_PUBLIC_POSTHOG_HOST,
+    api_host: "/ingest",
+    ui_host: "https://us.posthog.com",
     person_profiles: "identified_only",
     capture_pageview: false, // Handled manually in _app.tsx on routeChangeComplete
     capture_pageleave: true,

packages/kilo-docs/next.config.js

@@ -5,6 +5,7 @@ module.exports = withMarkdoc(/* config: https://markdoc.io/docs/nextjs#options *
   pageExtensions: ["js", "jsx", "ts", "tsx", "md", "mdoc"],
   basePath: "/docs",
   turbopack: {},
+  skipTrailingSlashRedirect: true,
   async redirects() {
     return [
       {
@@ -30,6 +31,11 @@ module.exports = withMarkdoc(/* config: https://markdoc.io/docs/nextjs#options *
           destination: "/api/llms.txt",
         },
       ],
+      afterFiles: [
+        { source: "/ingest/static/:path*", destination: "https://us-assets.i.posthog.com/static/:path*" },
+        { source: "/ingest/decide",        destination: "https://us.i.posthog.com/decide" },
+        { source: "/ingest/:path*",        destination: "https://us.i.posthog.com/:path*" },
+      ],
     }
   },
 })