Fix HTML entity decoding and broaden OSINT dedup window

- Replace single ' handler with generic numeric/hex entity decoder
  so ' and other unpadded entities are properly converted
- Dedup urgent OSINT posts against all hot memory runs (last 3 sweeps)
  instead of only the previous sweep, preventing posts that drop out
  of one sweep from reappearing as "new" in the next

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apis/sources/telegram.mjs

@@ -169,7 +169,10 @@ function parseWebPreview(html, channelId) {
         .replace(/&lt;/g, '<')
         .replace(/&gt;/g, '>')
         .replace(/&quot;/g, '"')
-        .replace(/&#039;/g, "'")
+        .replace(/&#0*39;/g, "'")
+        .replace(/&#x0*27;/gi, "'")
+        .replace(/&#(\d+);/g, (_, n) => String.fromCharCode(Number(n)))
+        .replace(/&#x([0-9a-f]+);/gi, (_, h) => String.fromCharCode(parseInt(h, 16)))
         .replace(/&nbsp;/g, ' ')
         .trim();
     }