Add server routes for companies, approvals, costs, and dashboard

New routes: companies, approvals, costs, dashboard, authz. New
services: companies, approvals, costs, dashboard, heartbeat,
activity-log. Add auth middleware and structured error handling.
Expand existing agent and issue routes with richer CRUD operations.

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

package.json

@@ -3,7 +3,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "pnpm run --parallel dev:server dev:ui",
+    "dev": "pnpm --parallel --filter @paperclip/server --filter @paperclip/ui dev",
     "dev:server": "pnpm --filter @paperclip/server dev",
     "dev:ui": "pnpm --filter @paperclip/ui dev",
     "build": "pnpm -r build",