Revert gokapi headless-env change: Gokapi (v1.9.6/v2.0.1) has no GOKAPI_USERNAME/PASSWORD env

Verified against Gokapi docs + the v1.9.6 binary: no env-var headless admin setup exists in any
version. Non-interactive setup requires a pre-seeded config.json + --deployment-password. Reverting
the non-functional env so the template isn't misleading; choosing a real fix path with the user.

templates/gokapi/.felhom.yml

@@ -32,13 +32,6 @@ deploy_fields:
     locked_after_deploy: true
     description: "Az alkalmazás aldomainje"
 
-  - env_var: GOKAPI_PASSWORD
-    label: "Admin jelszó"
-    type: password
-    generate: "password:24"
-    locked_after_deploy: true
-    description: "A Gokapi admin felhasználó (admin) jelszava — ezzel tudsz belépni a kezelőfelületre"
-
 # --- App info (info page content) ---
 app_info:
   tagline: "Ideiglenes fájlmegosztás lejáró linkekkel"

templates/gokapi/docker-compose.yml

@@ -13,11 +13,6 @@ services:
     restart: unless-stopped
     environment:
       - TZ=Europe/Budapest
-      # Headless first-run setup: GOKAPI_USERNAME/PASSWORD take effect only on the first start (when
-      # Gokapi creates its config). Without these, Gokapi sits in "maintenance mode" until /setup is
-      # completed by hand. Password is felhom-generated (see .felhom.yml deploy field).
-      - GOKAPI_USERNAME=admin
-      - GOKAPI_PASSWORD=${GOKAPI_PASSWORD}
     volumes:
       - gokapi_data:/app/data
       - gokapi_config:/app/config