feat(plugin-sdk): add TypeScript SDK for Infinite Canvas plugins with automatic JSX and build support

plugins/canvas/sdk/src/jsx-dev-runtime.ts

@@ -0,0 +1,16 @@
+// automatic JSX 的 dev 变体(编译器在 dev 模式会引用 jsxDEV)。转发到同一套 createElement。
+
+import type * as React from "react";
+
+import { getReact } from "./runtime";
+import { Fragment } from "./jsx-runtime";
+
+export { Fragment };
+export type { JSX } from "./jsx-runtime";
+
+export function jsxDEV(type: unknown, props: Record<string, unknown> | null, key?: unknown): React.ReactElement {
+    const react = getReact();
+    const resolvedType = type === Fragment ? react.Fragment : type;
+    const config = key === undefined ? props : { ...(props ?? {}), key };
+    return react.createElement(resolvedType as never, config as never);
+}