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/checks/database-check.ts

@@ -0,0 +1,57 @@
+import fs from "node:fs";
+import path from "node:path";
+import type { PaperclipConfig } from "../config/schema.js";
+import type { CheckResult } from "./index.js";
+
+export async function databaseCheck(config: PaperclipConfig): Promise<CheckResult> {
+  if (config.database.mode === "postgres") {
+    if (!config.database.connectionString) {
+      return {
+        name: "Database",
+        status: "fail",
+        message: "PostgreSQL mode selected but no connection string configured",
+        canRepair: false,
+        repairHint: "Run `paperclip configure --section database`",
+      };
+    }
+
+    try {
+      const { createDb } = await import("@paperclip/db");
+      const db = createDb(config.database.connectionString);
+      await db.execute("SELECT 1");
+      return {
+        name: "Database",
+        status: "pass",
+        message: "PostgreSQL connection successful",
+      };
+    } catch (err) {
+      return {
+        name: "Database",
+        status: "fail",
+        message: `Cannot connect to PostgreSQL: ${err instanceof Error ? err.message : String(err)}`,
+        canRepair: false,
+        repairHint: "Check your connection string and ensure PostgreSQL is running",
+      };
+    }
+  }
+
+  // PGlite mode — check data dir
+  const dataDir = path.resolve(config.database.pgliteDataDir);
+  if (!fs.existsSync(dataDir)) {
+    return {
+      name: "Database",
+      status: "warn",
+      message: `PGlite data directory does not exist: ${dataDir}`,
+      canRepair: true,
+      repair: () => {
+        fs.mkdirSync(dataDir, { recursive: true });
+      },
+    };
+  }
+
+  return {
+    name: "Database",
+    status: "pass",
+    message: `PGlite data directory exists: ${dataDir}`,
+  };
+}