docs: add app.md with metadata for fn_registry indexing

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app.md

@@ -0,0 +1,37 @@
+---
+name: element_matrix_chat
+lang: bash
+domain: infra
+description: "Stack completo Matrix autohosteado con Docker Compose: Synapse, Element Web, MAS, LiveKit, PostgreSQL, Synapse Admin."
+tags: [matrix, element, synapse, docker, selfhosted, chat, livekit, service]
+uses_functions: []
+uses_types: []
+framework: "docker-compose"
+entry_point: "docker-compose.yml"
+dir_path: "projects/element_agents/apps/element_matrix_chat"
+repo_url: "https://gitea-dgg044oo04woo4ggcsws4gk0.organic-machine.com/egutierrez/element_matrix_chat.git"
+---
+
+## Deploy
+
+- **VPS:** organic-machine.com (SSH alias: organic-machine.com)
+- **Remote path:** /home/ubuntu/CodeProyects/element_matrix_chat
+- **Deploy:** `docker-compose up -d` (+ `docker-compose -f docker-compose.livekit.yml up -d`)
+- **Setup:** `./scripts/setup.sh`
+- **Puertos:** Element 8081, Synapse Admin 8082, MAS 8083, LiveKit 7880-7882
+- **Config:** .env + configs/homeserver.yaml.template + element-config.json + mas/config.yaml
+
+## Notas
+
+Stack de 10+ containers Docker:
+- **Synapse** — Homeserver Matrix (Python)
+- **Element Web** — Cliente web React
+- **MAS** — Matrix Authentication Service (OIDC/OAuth)
+- **LiveKit** — SFU para videollamadas (Element Call)
+- **PostgreSQL x2** — BDs para Synapse y MAS
+- **Synapse Admin** — Panel de administracion
+- **Nginx** — Reverse proxy para .well-known
+- **LiveKit JWT** — Generador de tokens para RTC
+
+Red Docker: matrix_net (10.10.10.0/24), gestionada externamente.
+Coolify maneja el proxy principal (puertos 80/443).