fix(feishu): add targeted eslint-disable comments for SDK integration

Add line-specific eslint-disable-next-line comments for SDK type casts
and union type issues, rather than file-level disables.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

extensions/feishu/src/runtime.ts

@@ -1,5 +1,6 @@
 import type { PluginRuntime } from "openclaw/plugin-sdk";
 
+// eslint-disable-next-line @typescript-eslint/no-redundant-type-constituents
 let runtime: PluginRuntime | null = null;
 
 export function setFeishuRuntime(next: PluginRuntime) {