feat(meldingen): notifications — reply on comment, comment on post, like on post
For every logged-in user (Google visitors/fans and admin). Bell icon in the
header with unread counter + notifications page /notifications (via user menu
desktop + profile sheet mobile; badge also on the mobile Profile tab). Opening =
read. Triggers in comments (reply→comment author, top-level→post author) and
like (→post author); notify() skips notifying yourself. Table notifications
+ NotificationService. NL/EN/DE.
Co-Authored-By: Claude <noreply@…>
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