3.3.0 — Global scam blocklist, join-ping toggle, role toggle-off

Added

• Owner-curated global scam-image blocklist. A right-click "Toggle global scam block" command lets the bot owner mark an image's fingerprint as a known scam across every server, without shipping a build. Matches are treated like a normally-detected scam: each server's own dismissal still wins, and the owner's list never applies the harsher confirmed-punishment escalation reserved for a server's own confirmations. (#160)
• Welcome messages gain a per-server "Ping on join" toggle, so the member mention can still render as a clickable pill without firing a notification. On by default, so existing servers keep pinging. (#166)
• Open Graph and Twitter card meta tags, so a shared shrkbot link shows a proper title, description, and preview image. (#164)

Changed

• Single-selection role menus can now toggle a role off: clicking the role you already hold removes it without replacement, instead of doing nothing, so you can return to holding none of the set. (#167)
• The manual "Report as scam" and global-scam commands now inspect link-preview embeds and pasted CDN image links, not just attachments, matching the automatic scan. The per-source image cap is also raised from 3 -> 4. (#163)
• Confirmed scam-image fingerprints are now retained for 180 days instead of 30, so a moderator's confirmation survives a scam campaign going quiet for a month or more. (#171)
• The "Report as scam" action is now surfaced as an info callout under the consent warning on the Image Scanning page, instead of a small footer note. (#170)
• Scam-text keyword weights retuned for the current scam wave: added crypto-casino and bonus-offer terms, and lowered "withdraw" so it no longer flags on its own in legitimate messages. (#171)

Fixed

• shrkbot no longer double-posts its own kicks, bans, and timeouts to the moderation log. (#169)
• Toggling image scanning from the Server Shield overview page no longer wipes the confirmed-punishment settings on a config whose image-scanning options were never edited. (#165)
• The public site header logo now links to the home page. (#168)