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/llm.ts

@@ -0,0 +1,43 @@
+import * as p from "@clack/prompts";
+import type { LlmConfig } from "../config/schema.js";
+
+export async function promptLlm(): Promise<LlmConfig | undefined> {
+  const configureLlm = await p.confirm({
+    message: "Configure an LLM provider now?",
+    initialValue: false,
+  });
+
+  if (p.isCancel(configureLlm)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  if (!configureLlm) return undefined;
+
+  const provider = await p.select({
+    message: "LLM provider",
+    options: [
+      { value: "claude" as const, label: "Claude (Anthropic)" },
+      { value: "openai" as const, label: "OpenAI" },
+    ],
+  });
+
+  if (p.isCancel(provider)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  const apiKey = await p.password({
+    message: `${provider === "claude" ? "Anthropic" : "OpenAI"} API key`,
+    validate: (val) => {
+      if (!val) return "API key is required";
+    },
+  });
+
+  if (p.isCancel(apiKey)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  return { provider, apiKey };
+}