Update documentation to reflect non-local hosting environment

PLAN.md

@@ -71,6 +71,12 @@ src/
 - **Library:** `tmi.js` (client-side execution).
 - **Cost:** Zero server-side WebSocket processing.
 
+## Hosting & Infrastructure
+- **Target:** Proxmox LXC or VM (standalone).
+- **Architecture:** Client-side processing via `tmi.js` to ensure the server handles only authentication and configuration serving.
+- **Cost Efficiency:** Designed for "near-zero" server overhead to allow hosting on minimal hardware resources.
+- **Environment:** The development machine is exclusively for coding; the service will never be hosted on the dev machine.
+
 ## Implementation Phases
 1.  **Project Initialization:** Scaffolding Next.js, Tailwind, and Supabase client.
 2.  **Authentication:** Implementing NextAuth with Twitch.