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>

self-hosting/docker-compose.template.yml

@@ -23,7 +23,7 @@ services:
         max-file: "3"
 
   op-db:
-    image: postgres:14-alpine
+    image: postgres:18.3-alpine
     restart: always
     volumes:
       - op-db-data:/var/lib/postgresql/data
@@ -45,7 +45,7 @@ services:
     #   - 5432:5432
 
   op-kv:
-    image: redis:7.2.5-alpine
+    image: redis:8.6.2-alpine
     restart: always
     volumes:
       - op-kv-data:/data
@@ -65,7 +65,7 @@ services:
     #   - 6379:6379
 
   op-ch:
-    image: clickhouse/clickhouse-server:25.10.2.65
+    image: clickhouse/clickhouse-server:26.3.2.3
     restart: always
     volumes:
       - op-ch-data:/var/lib/clickhouse