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/database.ts

@@ -0,0 +1,48 @@
+import * as p from "@clack/prompts";
+import type { DatabaseConfig } from "../config/schema.js";
+
+export async function promptDatabase(): Promise<DatabaseConfig> {
+  const mode = await p.select({
+    message: "Database mode",
+    options: [
+      { value: "pglite" as const, label: "PGlite (embedded, no setup needed)", hint: "recommended" },
+      { value: "postgres" as const, label: "PostgreSQL (external server)" },
+    ],
+  });
+
+  if (p.isCancel(mode)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  if (mode === "postgres") {
+    const connectionString = await p.text({
+      message: "PostgreSQL connection string",
+      placeholder: "postgres://user:pass@localhost:5432/paperclip",
+      validate: (val) => {
+        if (!val) return "Connection string is required for PostgreSQL mode";
+        if (!val.startsWith("postgres")) return "Must be a postgres:// or postgresql:// URL";
+      },
+    });
+
+    if (p.isCancel(connectionString)) {
+      p.cancel("Setup cancelled.");
+      process.exit(0);
+    }
+
+    return { mode: "postgres", connectionString, pgliteDataDir: "./data/pglite" };
+  }
+
+  const pgliteDataDir = await p.text({
+    message: "PGlite data directory",
+    defaultValue: "./data/pglite",
+    placeholder: "./data/pglite",
+  });
+
+  if (p.isCancel(pgliteDataDir)) {
+    p.cancel("Setup cancelled.");
+    process.exit(0);
+  }
+
+  return { mode: "pglite", pgliteDataDir: pgliteDataDir || "./data/pglite" };
+}