feat(feishu): replace built-in SDK with community plugin

Replace the built-in Feishu SDK with the community-maintained
clawdbot-feishu plugin by @m1heng.

Changes:
- Remove src/feishu/ directory (19 files)
- Remove src/channels/plugins/outbound/feishu.ts
- Remove src/channels/plugins/normalize/feishu.ts
- Remove src/config/types.feishu.ts
- Remove feishu exports from plugin-sdk/index.ts
- Remove FeishuConfig from types.channels.ts

New features in community plugin:
- Document tools (read/create/edit Feishu docs)
- Wiki tools (navigate/manage knowledge base)
- Drive tools (folder/file management)
- Bitable tools (read/write table records)
- Permission tools (collaborator management)
- Emoji reactions support
- Typing indicators
- Rich media support (bidirectional image/file transfer)
- @mention handling
- Skills for feishu-doc, feishu-wiki, feishu-drive, feishu-perm

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

extensions/feishu/src/client.ts

@@ -0,0 +1,68 @@
+import * as Lark from "@larksuiteoapi/node-sdk";
+import type { FeishuConfig, FeishuDomain } from "./types.js";
+import { resolveFeishuCredentials } from "./accounts.js";
+
+let cachedClient: Lark.Client | null = null;
+let cachedConfig: { appId: string; appSecret: string; domain: FeishuDomain } | null = null;
+
+function resolveDomain(domain: FeishuDomain): Lark.Domain | string {
+  if (domain === "lark") return Lark.Domain.Lark;
+  if (domain === "feishu") return Lark.Domain.Feishu;
+  return domain.replace(/\/+$/, ""); // Custom URL, remove trailing slashes
+}
+
+export function createFeishuClient(cfg: FeishuConfig): Lark.Client {
+  const creds = resolveFeishuCredentials(cfg);
+  if (!creds) {
+    throw new Error("Feishu credentials not configured (appId, appSecret required)");
+  }
+
+  if (
+    cachedClient &&
+    cachedConfig &&
+    cachedConfig.appId === creds.appId &&
+    cachedConfig.appSecret === creds.appSecret &&
+    cachedConfig.domain === creds.domain
+  ) {
+    return cachedClient;
+  }
+
+  const client = new Lark.Client({
+    appId: creds.appId,
+    appSecret: creds.appSecret,
+    appType: Lark.AppType.SelfBuild,
+    domain: resolveDomain(creds.domain),
+  });
+
+  cachedClient = client;
+  cachedConfig = { appId: creds.appId, appSecret: creds.appSecret, domain: creds.domain };
+
+  return client;
+}
+
+export function createFeishuWSClient(cfg: FeishuConfig): Lark.WSClient {
+  const creds = resolveFeishuCredentials(cfg);
+  if (!creds) {
+    throw new Error("Feishu credentials not configured (appId, appSecret required)");
+  }
+
+  return new Lark.WSClient({
+    appId: creds.appId,
+    appSecret: creds.appSecret,
+    domain: resolveDomain(creds.domain),
+    loggerLevel: Lark.LoggerLevel.info,
+  });
+}
+
+export function createEventDispatcher(cfg: FeishuConfig): Lark.EventDispatcher {
+  const creds = resolveFeishuCredentials(cfg);
+  return new Lark.EventDispatcher({
+    encryptKey: creds?.encryptKey,
+    verificationToken: creds?.verificationToken,
+  });
+}
+
+export function clearClientCache() {
+  cachedClient = null;
+  cachedConfig = null;
+}