feat: add TypeScript support and shared types

- Added TypeScript configuration file (tsconfig.json) with strict settings.
- Introduced devDependencies for TypeScript in package.json.
- Added scripts for type checking and watching for changes.
- Created a new types file (lib/types.ts) defining shared types for the DevClaw plugin.

lib/types.ts

@@ -0,0 +1,17 @@
+/**
+ * Shared types for the DevClaw plugin.
+ *
+ * OpenClawPluginToolContext is declared in the plugin-sdk but not exported.
+ * We define a compatible local type for use in tool factory functions.
+ */
+
+export type ToolContext = {
+  config?: Record<string, unknown>;
+  workspaceDir?: string;
+  agentDir?: string;
+  agentId?: string;
+  sessionKey?: string;
+  messageChannel?: string;
+  agentAccountId?: string;
+  sandboxed?: boolean;
+};