fix(timelock): record alerts under website protocol keys

[spalen0]

Problem

Timelock alerts never appear on https://curation.yearn.fi/monitoring/ protocol pages (e.g. /monitoring/yearn/).

timelock_alerts.py passes its uppercase Telegram routing key (YEARN_TIMELOCK, CAP, 3JANE, INFINIFI, AAVE, …) to send_telegram_message, which also stores it as the alert's protocol. The website queries GET /v1/alerts?protocol=<key>&source=protocol with an exact-match key taken from each page's data-api-protocol (yearn, cap, 3jane, comp, ethplus, …), so every timelock alert was filtered out.

Live API confirms it: protocol=YEARN_TIMELOCK returns the missing Yearn timelock alerts; protocol=yearn does not.

Fix

• Telegram routing is unchanged.
• Alerts are now stored under the website key via the existing origin_protocol parameter: the lowercased routing key, with exceptions YEARN_TIMELOCK → yearn, RTOKEN → ethplus, LRT → pegs.
• The YEARN_TIMELOCK_INTERNAL mirror keeps its own key so the Yearn page doesn't show each alert twice.
• Tests for the key mapping and for how Yearn alerts are stored.

Open questions / follow-ups

• LRT → pegs is a guess. The lrt-pegs (and maple) pages currently have no alert table. pegs matches what the lrt-pegs scripts use.
• Past alerts are not moved. To show them, run on the production monitoring.db (not run):

  UPDATE alert_events
  SET protocol = CASE protocol WHEN 'YEARN_TIMELOCK' THEN 'yearn' WHEN 'RTOKEN' THEN 'ethplus'
                               WHEN 'LRT' THEN 'pegs' ELSE lower(protocol) END
  WHERE source = 'protocol'
    AND protocol IN ('YEARN_TIMELOCK','CAP','RTOKEN','LRT','INFINIFI','AAVE','COMP','FLUID','LIDO','MAPLE','STRATA','3JANE');

• /monitoring/timelock/ stays empty for source=protocol: it queries protocol=timelock, and an alert has one protocol key. Showing alerts there too needs a frontend/API change (multi-key filter or a metadata tag).

Testing

• pytest tests/test_timelock_alerts.py tests/test_monitoring_config.py: 21 passed
• ruff check: clean

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