fix: define VERT middlewares in file provider with environment variable

Fixed "middleware does not exist" error for VERT by defining all middlewares
in the file provider configuration instead of relying on Docker provider
middlewares from a stopped container (Sablier scale-to-zero).

Changes:
- Added vert-auth middleware using AUTH_USERS environment variable
- Added vert-compress middleware for gzip compression
- Passed AUTH_USERS to Traefik container via environment section
- Removed @docker suffixes from middleware references

This ensures middlewares are always available, even when the VERT container
is stopped by Sablier's dynamic scaling feature.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

proxy/compose.yaml

@@ -56,6 +56,9 @@ services:
       retries: 3
       start_period: 10s
 
+    environment:
+      - AUTH_USERS=${AUTH_USERS}
+
     networks:
       - compose_network
 

proxy/dynamic/vert-sablier.yaml

@@ -10,6 +10,14 @@ http:
             displayName: VERT File Converter
             theme: ghost
 
+    vert-auth:
+      basicAuth:
+        users:
+          - "{{ env "AUTH_USERS" }}"
+
+    vert-compress:
+      compress: {}
+
   services:
     vert-web-secure:
       loadBalancer:
@@ -24,7 +32,7 @@ http:
         - web-secure
       middlewares:
         - sablier-vert
-        - vert-auth@docker
-        - vert-web-secure-compress@docker
+        - vert-auth
+        - vert-compress
       tls:
         certResolver: resolver