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/probe.ts

@@ -0,0 +1,46 @@
+import type { FeishuConfig, FeishuProbeResult } from "./types.js";
+import { resolveFeishuCredentials } from "./accounts.js";
+import { createFeishuClient } from "./client.js";
+
+export async function probeFeishu(cfg?: FeishuConfig): Promise<FeishuProbeResult> {
+  const creds = resolveFeishuCredentials(cfg);
+  if (!creds) {
+    return {
+      ok: false,
+      error: "missing credentials (appId, appSecret)",
+    };
+  }
+
+  try {
+    const client = createFeishuClient(cfg!);
+    // Use im.chat.list as a simple connectivity test
+    // The bot info API path varies by SDK version
+    const response = await (client as any).request({
+      method: "GET",
+      url: "/open-apis/bot/v3/info",
+      data: {},
+    });
+
+    if (response.code !== 0) {
+      return {
+        ok: false,
+        appId: creds.appId,
+        error: `API error: ${response.msg || `code ${response.code}`}`,
+      };
+    }
+
+    const bot = response.bot || response.data?.bot;
+    return {
+      ok: true,
+      appId: creds.appId,
+      botName: bot?.bot_name,
+      botOpenId: bot?.open_id,
+    };
+  } catch (err) {
+    return {
+      ok: false,
+      appId: creds.appId,
+      error: err instanceof Error ? err.message : String(err),
+    };
+  }
+}