Migrate http:// feeds to https:// where it actually works; add feeds as https-only going forward

Android blocks cleartext by default (targetSdk 28+), so every http:// feed was
failing every single fetch ("CLEARTEXT communication ... not permitted"). Checked
each of this user's 9 http feeds live via curl:

- 6 work fine over https (5 are a plain scheme swap; divingforpearlsblog.com's own
  https endpoint redirects through an insecure feedburner hop, so that one points
  straight at feedburner's https endpoint instead) -- migrated via a new Room
  migration (v6->v7), rewriting both the feed row and its articles' feedId so
  read history isn't orphaned. Confirmed live: all 6 now fetch clean with no
  lastError.
- 3 have no usable https at all (bit-player.org: connection refused, no TLS
  listener; blog.securitymouse.com: broken TLS handshake; webpolicy.org: a
  certificate that doesn't match the hostname) and are deliberately left alone.

Going forward, adding a feed (manually or via OPML import) upgrades a given
http:// URL to https:// before using it -- most sites serve identical content
either way, and a site with no real https support just fails its very next
fetch attempt the normal way instead of silently subscribing to a feed that
can never actually update.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

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