feat(farm-aggregator): add Dropbox folder explorer script

Recursively lists /Farm folder contents so you can see what data
is available to route into DairyComp / FeedLync subfolders.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KBD2dN2KEjzz3UQFa9hEpu

farm-aggregator/scripts/dropbox-explore.js

@@ -0,0 +1,39 @@
+/**
+ * Lists all files under /Farm in Dropbox so you can see what's available.
+ * Run from the farm-aggregator directory:
+ *   node scripts/dropbox-explore.js
+ */
+import 'dotenv/config';
+import { Dropbox } from 'dropbox';
+
+const dbx = new Dropbox({
+  clientId:     process.env.DROPBOX_APP_KEY,
+  clientSecret: process.env.DROPBOX_APP_SECRET,
+  refreshToken: process.env.DROPBOX_REFRESH_TOKEN,
+});
+
+async function listFolder(path, indent = '') {
+  try {
+    const res = await dbx.filesListFolder({ path, recursive: false });
+    for (const entry of res.result.entries) {
+      if (entry['.tag'] === 'folder') {
+        console.log(`${indent}📁 ${entry.name}/`);
+        await listFolder(entry.path_lower, indent + '  ');
+      } else {
+        const size = entry.size ? `(${(entry.size / 1024).toFixed(1)} KB)` : '';
+        const date = entry.client_modified?.slice(0, 10) ?? '?';
+        console.log(`${indent}📄 ${entry.name} ${size} — ${date}`);
+      }
+    }
+    if (res.result.entries.length === 0) {
+      console.log(`${indent}(empty)`);
+    }
+  } catch (e) {
+    console.log(`${indent}⚠ Could not read ${path}: ${e.message}`);
+  }
+}
+
+console.log('Scanning your Dropbox /Farm folder...\n');
+listFolder('/Farm').then(() => {
+  console.log('\nDone. Copy relevant files into /Farm/DairyComp or /Farm/FeedLync.');
+});