feat: add Gitea CI workflows, production compose, and update all deps

- Add .gitea/workflows for building and pushing api, dashboard, and worker images to git.zias.be registry
- Add docker-compose.prod.yml using pre-built registry images (no build-from-source on server)
- Update docker-compose.yml infra images to latest (postgres 18.3, redis 8.6.2, clickhouse 26.3.2.3)
- Update self-hosting/docker-compose.template.yml image versions to match
- Bump Node.js to 22.22.2 in all three Dockerfiles
- Update pnpm to 10.33.0 and upgrade all safe npm dependencies
- Add buffer-equal-constant-time patch

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/integrations/package.json

@@ -7,8 +7,8 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@slack/bolt": "^3.18.0",
-    "@slack/oauth": "^3.0.0"
+    "@slack/bolt": "^3.22.0",
+    "@slack/oauth": "^3.0.5"
   },
   "devDependencies": {
     "@openpanel/tsconfig": "workspace:*",