Merge Docusaurus site: all content under docs/, align with gregFramework split layout

- Move markdown and wiki-import tree into docs/; keep app shell at repo root
- Point docusaurus docs path to docs/; edit links to mleem97/gregWiki
- Sync and i18n scripts use gregWiki root and ../.wiki under gregFramework
- Sidebars: workspace layout from root docs ids; plugins under mods/extensions
- Fix redirects, module catalog URLs, release note paths, and wiki-import category keys
- Update repo inventory for split repos; Dockerfile for single-repo context

Made-with: Cursor

docs/meta/devserver-betas.md

@@ -0,0 +1,25 @@
+# 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.