Add CLI package, config file support, and workspace setup

Add cli/ package with initial scaffolding. Add config-schema to shared
package for typed configuration. Add server config-file loader for
paperclip.config.ts support. Register cli in pnpm workspace. Add
.paperclip/ and .pnpm-store/ to gitignore. Minor Companies page fix.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cli/src/prompts/server.ts

@@ -0,0 +1,35 @@
+import * as p from "@clack/prompts";
+import type { ServerConfig } from "../config/schema.js";
+
+export async function promptServer(): Promise<ServerConfig> {
+  const portStr = await p.text({
+    message: "Server port",
+    defaultValue: "3100",
+    placeholder: "3100",
+    validate: (val) => {
+      const n = Number(val);
+      if (isNaN(n) || n < 1 || n > 65535 || !Number.isInteger(n)) {
+        return "Must be an integer between 1 and 65535";
+      }
+    },
+  });
+
+  if (p.isCancel(portStr)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  const port = Number(portStr) || 3100;
+
+  const serveUi = await p.confirm({
+    message: "Serve the UI from the server?",
+    initialValue: false,
+  });
+
+  if (p.isCancel(serveUi)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  return { port, serveUi };
+}