fix: add MIME version to outgoing mail

Allow configuring delegation account limits in config

fix(api): dont do rotation key validation in signPlcOperation as it blocks migrations

feat(docs): explain our definition of "correct PDS implementation"

feat(config): add more default crawlers/relays

totp: let legacy sessions disable totp

fix(api): dont verify signature or DID during importRepo

feat(test): test that websockets get closed

feat(tranquil-store): gc and hardening