chore: update .env.template to align with README.md

.env.template

@@ -1,11 +1,10 @@
-
 # Your openai api key. (required)
 OPENAI_API_KEY=sk-xxxx
 
 # Access password, separated by comma. (optional)
 CODE=your-password
 
-# You can start service behind a proxy
+# You can start service behind a proxy. (optional)
 PROXY_URL=http://localhost:7890
 
 # (optional)
@@ -47,6 +46,15 @@ ENABLE_BALANCE_QUERY=
 # If you want to disable parse settings from url, set this value to 1.
 DISABLE_FAST_LINK=
 
+# (optional)
+# Default: Empty
+# To control custom models, use + to add a custom model, use - to hide a model, use name=displayName to customize model name, separated by comma.
+CUSTOM_MODELS=
+
+# (optional)
+# Default: Empty
+# Change default model
+DEFAULT_MODEL=
 
 # anthropic claude Api Key.(optional)
 ANTHROPIC_API_KEY=
@@ -54,8 +62,6 @@ ANTHROPIC_API_KEY=
 ### anthropic claude Api version. (optional)
 ANTHROPIC_API_VERSION=
 
-
-
 ### anthropic claude Api url (optional)
 ANTHROPIC_URL=