feat(cliproxy): integrate missing provider support

config/base-gitlab.settings.json

@@ -0,0 +1,10 @@
+{
+  "env": {
+    "ANTHROPIC_BASE_URL": "http://127.0.0.1:8317/api/provider/gitlab",
+    "ANTHROPIC_AUTH_TOKEN": "ccs-internal-managed",
+    "ANTHROPIC_MODEL": "gitlab-duo",
+    "ANTHROPIC_DEFAULT_OPUS_MODEL": "duo-chat-opus-4-6",
+    "ANTHROPIC_DEFAULT_SONNET_MODEL": "duo-chat-sonnet-4-6",
+    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "duo-chat-haiku-4-5"
+  }
+}