feat: migrate all stacks to Coolify (proxy network, clean labels, pull_policy)

- Remove traefik.enable, traefik.docker.network, traefik.http.routers.* from all services
- Keep traefik.http.services.<name>.loadbalancer.server.port labels
- Keep all middleware definitions (forwardauth, headers, redirects)
- Add pull_policy: always to main/frontend services
- Add proxy network + label to gitea and karakeep (previously missing)
- Add COOLIFY-TEMPLATE.md reference guide

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

karakeep/docker-compose.yml

@@ -40,6 +40,9 @@ services:
       - karakeep-chrome
     networks:
       - karakeep_internal
+      - proxy
+    labels:
+      traefik.http.services.karakeep.loadbalancer.server.port: "3000"
 
   karakeep-chrome:
     image: gcr.io/zenika-hub/alpine-chrome:124
@@ -70,3 +73,5 @@ services:
 networks:
   karakeep_internal:
     driver: bridge
+  proxy:
+    external: true