feat: add flaskpaste plugin with paste/shorten commands

- PoW-authenticated paste creation and URL shortening via FlaskPaste
- !paste <text> creates a paste, !shorten <url> shortens a URL
- Module-level shorten_url/create_paste helpers for cross-plugin use
- Alert plugin auto-shortens URLs in announcements and history output
- Custom TLS CA cert support via secrets/flaskpaste/derp.crt
- No SOCKS proxy -- direct urllib.request to FlaskPaste instance

plugins/alert.py

@@ -1753,10 +1753,18 @@ async def _poll_once(bot, key: str, announce: bool = True) -> None:
         if announce and matched:
             channel = data["channel"]
             name = data["name"]
+            fp = bot.registry._modules.get("flaskpaste")
             for item in matched:
                 short_id = _save_result(channel, name, tag, item)
                 title = _truncate(item["title"]) if item["title"] else "(no title)"
                 url = item["url"]
+                if fp and url:
+                    try:
+                        url = await loop.run_in_executor(
+                            None, fp.shorten_url, bot, url,
+                        )
+                    except Exception:
+                        pass
                 date = item.get("date", "")
                 line = f"[{name}/{tag}/{short_id}]"
                 if date:
@@ -1936,9 +1944,18 @@ async def cmd_alert(bot, message):
         if not rows:
             await bot.reply(message, f"{name}: no history yet")
             return
+        loop = asyncio.get_running_loop()
+        fp = bot.registry._modules.get("flaskpaste")
         for backend, title, url, date, found_at, short_id in reversed(rows):
             ts = found_at[:10]
             title = _truncate(title) if title else "(no title)"
+            if fp and url:
+                try:
+                    url = await loop.run_in_executor(
+                        None, fp.shorten_url, bot, url,
+                    )
+                except Exception:
+                    pass
             line = f"[{name}/{backend}/{short_id}] ({date or ts}) {title}"
             if url:
                 line += f" -- {url}"