feat(v1.1.6-client): @picloud/client TypeScript package

First frontend library (v1.0.0), co-shipped with realtime. Hybrid
model — no direct service access from the browser.

- endpoint<Req,Res>(path).get()/.post() — typed HTTP, auth-token
  injection, structured errors, optional zod/valibot validate adapter.
- subscribe(topic, cb, {token, onTokenExpired}) — streaming-fetch SSE
  with exponential-backoff reconnect, 401 token refresh, Last-Event-ID
  resume.
- auth.login/logout/token over dev-defined endpoints.
- React (useTopic/useEndpoint + PicloudProvider) and Svelte
  (topicStore/endpointStore) subpath exports.

Build: tsup (ESM+CJS+.d.ts); tests: vitest (15); lint: tsc --noEmit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/typescript/tsup.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from 'tsup';
+
+// Dual ESM + CJS emit with .d.ts for the main entry and the two
+// framework subpath exports. React and Svelte are peer deps — kept
+// external so the lib never bundles a framework copy.
+export default defineConfig({
+  entry: {
+    index: 'src/index.ts',
+    'react/index': 'src/react/index.ts',
+    'svelte/index': 'src/svelte/index.ts'
+  },
+  format: ['esm', 'cjs'],
+  dts: true,
+  clean: true,
+  sourcemap: true,
+  treeshake: true,
+  external: ['react', 'svelte', 'svelte/store']
+});