Groundwork for per-company Slack apps. Each Slack app gets its own row with encrypted secrets, and Slack posts to /slack/apps/<app id>/..., where the address only selects which secret to check; a request acts only in a workspace where that app is installed. Rate limits are per address and per app, so one workspace can't hold up another's posts. Schema changes are additive. The existing staging app keeps working on the old route until a documented cutover. Inert for users.
Adds Discord as a second connector adapter on the shared core: signed interactions for answer buttons, one gateway worker (same image, single leader by database lock, commits on the lock's connection, checkpoints for resume), thread posts through the shared post queue, owner-only control, and teammate context only from linked accounts. Inert until the Discord settings are configured. A narrow gitleaks allowlist entry covers connector Discord env var names in config errors.
Moves the push gateway's database layer into a shared cloud/packages/cloud-database package (service name and schema passed in). Push's behaviour, log names, SQLite file and tests are unchanged.
Jinwoo Hong