feat(mail): share oleksandra.svitelska mailbox with info@ (read-only)

Add oleksandra.svitelska@produktor.io to PRODUCTION_OWNERS so info@
sees it under Shared/ (lookup read), same class as the other production
mailboxes. Applied live via user-patches.sh (idempotent); no container
recreation needed.

README.md

@@ -17,6 +17,7 @@ mailboxes:
 
 - `info@produktor.io` — human reader (Roundcube login for the whole list)
 - `andriy.oblivantsev@produktor.io`
+- `oleksandra.svitelska@produktor.io`
 - `ano@produktor.io`
 - `postmaster@produktor.io`
 - `postman@produktor.io`
@@ -115,8 +116,8 @@ Roundcube covers the whole account list. Delivery is unchanged (no aliases, no
 redirects); other accounts keep their own passwords. Two owner classes, two
 right sets for `info@`:
 
-- **production owners** (`ano@`, `andriy.oblivantsev@`, `postmaster@`):
-  read-only — `lookup read` (issue #79);
+- **production owners** (`ano@`, `andriy.oblivantsev@`, `oleksandra.svitelska@`,
+  `postmaster@`): read-only — `lookup read` (issue #79);
 - **incubator owners** (one account per historical address of the owner:
   `andriy.oblivantsev@wheregroup.com` for the гдеgroup period; later
   `eslider@gmail.com`, `...@viscreation.de`, ...): read **and delete** —

config/user-patches.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 # Dovecot shared mailboxes. info@produktor.io gets access to the mailboxes of
 # two owner classes (issue #79, issue #251 / epic #250):
-#   - production owners (ano@, andriy.oblivantsev@, postmaster@): read-only
+#   - production owners (ano@, andriy.oblivantsev@, oleksandra.svitelska@,
+#     postmaster@): read-only
 #     (`lookup read`) — one login in Roundcube covers the whole account list;
 #   - incubator owners: read + delete (`lookup read delete expunge
 #     write-deleted`) — the mailbox owner never logs in, mail is imported via
@@ -37,7 +38,7 @@ chmod 0770 "${SHARED_DB_DIR}"
 #    NOT required; `expunge` is also what Dovecot MOVE needs on the source side
 #    when Roundcube moves a deleted message to Trash.
 READER='info@produktor.io'
-PRODUCTION_OWNERS='ano@produktor.io andriy.oblivantsev@produktor.io postmaster@produktor.io'
+PRODUCTION_OWNERS='ano@produktor.io andriy.oblivantsev@produktor.io postmaster@produktor.io oleksandra.svitelska@produktor.io'
 INCUBATOR_OWNERS='andriy.oblivantsev@wheregroup.com eslider@gmail.com viscreation@gmail.com viscreation@gmx.de andriy.oblivantsev@gridfactor.de ao@rpf.de andriy.oblivantsev@gmail.com viscreation@viscreation.de'
 
 grant_share() { # $1=owner, remaining=right names