docs: release notes format and patch notes for v2.0.0-beta to v2.4.0-beta

docs/releases/v2.4.0-beta.md

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+RenewCMS now knows who owns the workspace. The owner manages invites, including cancelling and renewing them, while every admin keeps the same access to content. A new Settings page shows which build is running.
+
+## New
+
+**Owner and admin roles**
+- The first registered account is the owner. Everyone who joins through an invite is an admin.
+- Only the owner can send, cancel or renew invites. Admins keep the same access to articles, images, the Users list, their Profile and Settings.
+- There is exactly one owner. Roles can't be changed or transferred yet.
+- Existing installs are migrated automatically: the oldest account becomes the owner and every other account an admin.
+
+**Invite management**
+- Pending invites get a Cancel invite action on the Users page. The invite link stops working.
+- Expired invites get a Renew invite action. It sends a new email with a new personal link valid for 3 days, and the old link stays dead.
+
+**Users list**
+- The Users table and the mobile card list now show Email, Display name (a dash when empty), Role, Invite status and Created.
+- A new role badge tells the owner and admins apart.
+
+**Settings page**
+- A new Settings page at `/settings` sits after Integration in the sidebar and the mobile drawer. It shows the version of the running build.
+
+## Improvements and fixes
+- The desktop account menu's icons, labels and check mark are now centred in their 32 px rows.
+- The account menu follows the redesigned board: System, Light and Dark stay in both the menu and the mobile sheet.
+- The article editor's toolbar scrolls horizontally on mobile instead of overflowing.
+- The editor's last-saved label now moves from minutes to hours and days instead of counting minutes only.
+
+## API
+- `DELETE /v1/user/invite/{id}` cancels a pending invite and returns 204.
+- `POST /v1/user/invite/{id}/renew` returns 200 with a new code, sets `expires_at` to now plus 3 days and `created_at` to now, and resends the invitation email.
+- Changed: `POST /v1/user/invite` is now owner-only, like the two endpoints above. Other users get 403 with "Only the owner can do this."
+- `GET /v1/settings` (authenticated, verified users) returns the running build's version.
+- Changed: user objects from `GET /v1/user/`, `GET /v1/auth/me` and `POST /v1/auth/verify` now include `role` (`owner` or `admin`).
+
+## Upgrading
+- Replace the binary and restart. Your `.env` and SQLite file stay as they are.
+- The database migrates itself on startup. It adds a `role` column to `users` and fills it in: the account with the lowest id becomes the owner, every other account an admin. A database that already has roles is left unchanged. Back up your SQLite file first as a precaution.
+- Behaviour change: admins who joined through a v2.3.0-beta invite can no longer send invites.
+- No new environment variables.
+
+## Known limitations
+- No endpoint changes or transfers the owner role, and users can't be removed yet.