chore: remove vert-sablier.yaml as Vert no longer uses Sablier

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

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

proxy/dynamic/vert-sablier.yaml

@@ -1,38 +0,0 @@
-http:
-  middlewares:
-    sablier-vert:
-      plugin:
-        sablier:
-          names: vert_app
-          sablierUrl: http://sablier_app:10000
-          sessionDuration: 1h
-          dynamic:
-            displayName: VERT File Converter
-            theme: ghost
-
-    vert-auth:
-      basicAuth:
-        users:
-          - '{{ env "AUTH_USERS" }}'
-
-    vert-compress:
-      compress: {}
-
-  services:
-    vert-web-secure:
-      loadBalancer:
-        servers:
-          - url: "http://vert_app:80"
-
-  routers:
-    vert-web-secure:
-      rule: "Host(`vert.pivoine.art`)"
-      service: vert-web-secure
-      entryPoints:
-        - web-secure
-      middlewares:
-        - sablier-vert
-        - vert-auth
-        - vert-compress
-      tls:
-        certResolver: resolver