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/runtime.ts

@@ -0,0 +1,14 @@
+import type { PluginRuntime } from "openclaw/plugin-sdk";
+
+let runtime: PluginRuntime | null = null;
+
+export function setFeishuRuntime(next: PluginRuntime) {
+  runtime = next;
+}
+
+export function getFeishuRuntime(): PluginRuntime {
+  if (!runtime) {
+    throw new Error("Feishu runtime not initialized");
+  }
+  return runtime;
+}