chore(env): clean up .env.default and parameterize container names

- Remove 16 dead variables (OSIT_ENV, AE_API_ENV, AE_APP_ENV, AE_FLASK_APP_SRC,
  AE_DB_ROOT_PASSWORD, OSIT_WEB_HTTPS_PORT, 5x DOCKER_AE_*_EXTRA_HOST,
  CONTAINER_AE_API/APP/MARIADB/PMA)
- Add missing vars: AE_NETWORK_NAME, CONTAINER_DOZZLE, AE_DOZZLE_PORT
- Parameterize hardcoded container names in compose: CONTAINER_MARIADB,
  CONTAINER_PMA, CONTAINER_AE_OPS (all with :-default fallbacks)
- Fix AE_DB_EXTERNAL_PORT default: 3306 → 32768 (avoids host MariaDB conflict)
- Reorganize: AE_APP_GATEWAY_PORT moved next to AE_API_GATEWAY_PORT

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -64,7 +64,7 @@ services:
     mariadb:
         restart: always
         image: mariadb:10.11
-        container_name: ae_mariadb_dev
+        container_name: ${CONTAINER_MARIADB:-ae_mariadb_dev}
         profiles: ["database"]
         networks:
             - shared
@@ -96,7 +96,7 @@ services:
     phpmyadmin:
         restart: always
         image: phpmyadmin/phpmyadmin
-        container_name: ae_pma_dev
+        container_name: ${CONTAINER_PMA:-ae_pma_dev}
         profiles: ["database"]
         networks:
             - shared
@@ -210,7 +210,7 @@ services:
 
     ae_ops:
         # ... (same as before) ...
-        container_name: ae_ops_dev
+        container_name: ${CONTAINER_AE_OPS:-ae_ops_dev}
         image: alpine:latest
         restart: always
         profiles: ["database"]