feat(bots): anonConfess + shitpostLeaderboard built-in bots

- ConfessBot: polls for /confess messages, deletes original, reposts anonymous
- LeaderboardBot: daily top-10 message count recap from DB
- BotFunc extended with *sql.DB param for DB-reading bots
- Both types registered in runner + BotManager UI

web/src/components/BotManager.tsx

@@ -13,6 +13,18 @@ const BOT_TYPE_CONFIGS: Record<string, { label: string; fields: { key: string; l
       { key: 'poll_minutes', label: 'POLL INTERVAL (min)', type: 'number', placeholder: '30' },
     ],
   },
+  confess: {
+    label: 'Anonymous Confessions',
+    fields: [
+      { key: 'channel_id', label: 'CONFESSIONS CHANNEL', type: 'channel', placeholder: 'where confessions land' },
+    ],
+  },
+  leaderboard: {
+    label: 'Shitpost Leaderboard',
+    fields: [
+      { key: 'channel_id', label: 'CHANNEL', type: 'channel', placeholder: 'where recaps land' },
+    ],
+  },
 };
 
 export function BotManager() {