fix: version bump 0.3.2, remove debug log, dynamic /api version, Pro plan 5000 PDFs

1. Version bump to 0.3.2
2. Remove debug console.log('CACHE HIT:') from static asset middleware
3. /api endpoint: hardcoded version → dynamic from package.json
4. OpenAPI docs + terms: Pro plan 10,000 → 5,000 PDFs/month
5. Remove .backup files

src/routes/health.ts.backup

@@ -1,21 +0,0 @@
-import { Router } from "express";
-import { getPoolStats } from "../services/browser.js";
-
-export const healthRouter = Router();
-
-healthRouter.get("/", (_req, res) => {
-  const pool = getPoolStats();
-  res.json({
-    status: "ok",
-    version: "0.2.1",
-    pool: {
-      size: pool.poolSize,
-      active: pool.totalPages - pool.availablePages,
-      available: pool.availablePages,
-      queueDepth: pool.queueDepth,
-      pdfCount: pool.pdfCount,
-      restarting: pool.restarting,
-      uptimeSeconds: Math.round(pool.uptimeMs / 1000),
-    },
-  });
-});