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>

src/channels/plugins/normalize/feishu.ts

@@ -1,5 +0,0 @@
-export function normalizeFeishuTarget(raw: string): string {
-  let normalized = raw.replace(/^(feishu|lark):/i, "").trim();
-  normalized = normalized.replace(/^(group|chat|user|dm):/i, "").trim();
-  return normalized;
-}

src/channels/plugins/outbound/feishu.ts

@@ -1,52 +0,0 @@
-import type { ChannelOutboundAdapter } from "../types.js";
-import { chunkMarkdownText } from "../../../auto-reply/chunk.js";
-import { getFeishuClient } from "../../../feishu/client.js";
-import { sendMessageFeishu } from "../../../feishu/send.js";
-
-function resolveReceiveIdType(target: string): "open_id" | "union_id" | "chat_id" {
-  const trimmed = target.trim().toLowerCase();
-  if (trimmed.startsWith("ou_")) {
-    return "open_id";
-  }
-  if (trimmed.startsWith("on_")) {
-    return "union_id";
-  }
-  return "chat_id";
-}
-
-export const feishuOutbound: ChannelOutboundAdapter = {
-  deliveryMode: "direct",
-  chunker: (text, limit) => chunkMarkdownText(text, limit),
-  chunkerMode: "markdown",
-  textChunkLimit: 2000,
-  sendText: async ({ to, text, accountId }) => {
-    const client = getFeishuClient(accountId ?? undefined);
-    const result = await sendMessageFeishu(
-      client,
-      to,
-      { text },
-      {
-        receiveIdType: resolveReceiveIdType(to),
-      },
-    );
-    return {
-      channel: "feishu",
-      messageId: result?.message_id || "unknown",
-      chatId: to,
-    };
-  },
-  sendMedia: async ({ to, text, mediaUrl, accountId }) => {
-    const client = getFeishuClient(accountId ?? undefined);
-    const result = await sendMessageFeishu(
-      client,
-      to,
-      { text: text || "" },
-      { mediaUrl, receiveIdType: resolveReceiveIdType(to) },
-    );
-    return {
-      channel: "feishu",
-      messageId: result?.message_id || "unknown",
-      chatId: to,
-    };
-  },
-};