chore: initialize gregWiki standalone repository

devserver-betas.md

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+# DevServer API — beta channels (`gregframework.eu`)
+
+This document defines the **intended** client contract for the FrikaMF **WorkshopUploader** “Betas” panel. The server may be implemented separately; keep URLs and tokens configurable.
+
+## Base URL
+
+- Default: `https://gregframework.eu`
+- Override: user settings file next to the app (not committed to git).
+
+## Endpoints (proposed)
+
+| Method | Path | Purpose |
+|--------|------|---------|
+| `GET` | `/api/v1/betas` | List available beta channels (id, name, description). |
+| `POST` | `/api/v1/betas/{id}/subscribe` | Enroll the current user (body: Steam ID or bearer token from OAuth). |
+| `POST` | `/api/v1/betas/{id}/unsubscribe` | Leave a channel. |
+
+## Authentication
+
+- **Preferred:** Short-lived JWT after browser OAuth to `gregframework.eu`, stored in user settings.
+- **Alternative:** Steam ID from Steamworks session in the WorkshopUploader process, plus server-side verification.
+
+## Rate limiting and errors
+
+Clients should show HTTP status and response body on failure; retry with backoff.