Refactor codebase, introduce relaymode package, update constants and improve consistency

- Refactor constant definitions and organization
- Clean up package level variables and functions
- Introduce new `relaymode` and `apitype` packages for constant definitions
- Refactor and simplify code in several packages including `openai`, `relay/channel/baidu`, `relay/util`, `relay/controller`, `relay/channeltype`
- Add helper functions in `relay/channeltype` package to convert channel type constants to corresponding API type constants
- Remove deprecated functions such as `ResponseText2Usage` from `relay/channel/openai/helper.go`
- Modify code in `relay/util/validation.go` and related files to use new `validator.ValidateTextRequest` function
- Rename `util` package to `relaymode` and update related imports in several packages

web/default/src/components/utils.js

@@ -17,4 +17,13 @@ export async function onGitHubOAuthClicked(github_client_id) {
   window.open(
     `https://github.com/login/oauth/authorize?client_id=${github_client_id}&state=${state}&scope=user:email`
   );
+}
+
+export async function onLarkOAuthClicked(lark_client_id) {
+  const state = await getOAuthState();
+  if (!state) return;
+  let redirect_uri = `${window.location.origin}/oauth/lark`;
+  window.open(
+    `https://open.feishu.cn/open-apis/authen/v1/index?redirect_uri=${redirect_uri}&app_id=${lark_client_id}&state=${state}`
+  );
 }