feat(analytics): add Rybbit proxy rewrites and env vars

- Add Next.js rewrites to proxy /api/script.js and /api/track through self-hosted Rybbit
- This bypasses ad blockers that would block rybbit.nodecrew.me directly
- Add NEXT_PUBLIC_RYBBIT_HOST and NEXT_PUBLIC_RYBBIT_SITE_ID env vars to K8s deployment

src/lib/services/RybbitService.ts

@@ -12,8 +12,8 @@ declare global {
   }
 }
 
-export const RYBBIT_HOST = "https://rybbit.nodecrew.me";
-export const RYBBIT_SITE_ID = "1";
+export const RYBBIT_HOST = process.env.NEXT_PUBLIC_RYBBIT_HOST || "https://rybbit.nodecrew.me";
+export const RYBBIT_SITE_ID = process.env.NEXT_PUBLIC_RYBBIT_SITE_ID || "1";
 
 /**
  * Check if Rybbit is loaded and available