Bump remaining apps: major version slots and infrastructure

New version slots (major version jumps):
- gitea: 1.24.3 -> 28.2.0 (slot 1 -> 28)
- ghost: 5.130.6 -> 6.72.0 (slot 5 -> 6)
- formbricks: 3.6.0 -> 6.1.0 (slot 3 -> 6)
- mattermost: 10.8.1 -> 12.0.1 (slot 10 -> 12)
- zulip: 9.4 -> 12.3 (slot 9 -> 12)
- immich: 1.135.3 -> 3.3.5 (slot 1 -> 3)
- openproject: 16.1.1 -> 17.9.3 (slot 16 -> 17)
- listmonk: 5.0.3 -> 6.1.0 (slot 5 -> 6)
- discourse: 3.5.3 -> 2026.10.0 (slot 3 -> 2026, calver)

Same-slot large bumps:
- vllm: 0.9.2 -> 0.32.0
- longhorn: v1.8.1 -> v1.13.0

Infrastructure:
- cert-manager: v1.17.2 -> v1.21.2
- coredns: v1.12.0 -> v1.14.7
- externaldns: v0.13.4 -> v0.23.0
- metallb: v0.15.0 -> v0.16.1
- mysql: 9.1.0 -> 9.7.4
- node-feature-discovery: v0.17.3 -> v0.20.1
- nvidia-device-plugin: v0.17.1 -> v0.20.1

discourse/versions/2026/README.md

@@ -0,0 +1,35 @@
+# Discourse
+
+Discourse is a modern, open-source discussion platform designed for online communities and forums.
+
+## Dependencies
+
+- **PostgreSQL** - Database for storing application data
+- **Redis** - Used for caching and background jobs
+
+## Configuration
+
+Key settings configured through your instance's `config.yaml`:
+
+- **domain** - Where Discourse will be accessible (default: `discourse.{your-cloud-domain}`)
+- **adminEmail** - Admin account email (defaults to your operator email)
+- **adminUsername** - Admin account username (default: `admin`)
+- **siteName** - Your community name (default: `Community`)
+- **SMTP** - Email delivery settings inherited from your Wild Cloud instance
+
+## Access
+
+After deployment, Discourse will be available at:
+- `https://discourse.{your-cloud-domain}`
+
+## First-Time Setup
+
+1. Add and deploy the app:
+   ```bash
+   wild app add discourse
+   wild app deploy discourse
+   ```
+
+2. Log in with the admin credentials configured during setup
+
+3. Complete the setup wizard to configure your community