fix(memory): use bodyStore to avoid closure capturing request body

Problem:
- Stream response handlers (res.on) captured requestOptions in closures
- requestOptions contained originalBodyString (~800KB per request)
- These strings couldn't be GC'd until stream completed
- With concurrent requests, memory accumulated rapidly

Solution:
- Store request body strings in this.bodyStore Map with unique ID
- Pass only bodyStoreId in requestOptions (not the 800KB string)
- Closures capture small ID, not large string
- Clean up bodyStore on request completion (success/error/timeout)
- Extract needed values before closures to avoid capturing body object

package-lock.json

@@ -20,6 +20,7 @@
         "dotenv": "^16.3.1",
         "express": "^4.18.2",
         "google-auth-library": "^10.1.0",
+        "heapdump": "^0.3.15",
         "helmet": "^7.1.0",
         "https-proxy-agent": "^7.0.2",
         "inquirer": "^8.2.6",
@@ -5398,6 +5399,19 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/heapdump": {
+      "version": "0.3.15",
+      "resolved": "https://registry.npmjs.org/heapdump/-/heapdump-0.3.15.tgz",
+      "integrity": "sha512-n8aSFscI9r3gfhOcAECAtXFaQ1uy4QSke6bnaL+iymYZ/dWs9cqDqHM+rALfsHUwukUbxsdlECZ0pKmJdQ/4OA==",
+      "hasInstallScript": true,
+      "license": "ISC",
+      "dependencies": {
+        "nan": "^2.13.2"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/helmet": {
       "version": "7.2.0",
       "resolved": "https://registry.npmmirror.com/helmet/-/helmet-7.2.0.tgz",
@@ -7013,6 +7027,12 @@
       "integrity": "sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==",
       "license": "ISC"
     },
+    "node_modules/nan": {
+      "version": "2.24.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.24.0.tgz",
+      "integrity": "sha512-Vpf9qnVW1RaDkoNKFUvfxqAbtI8ncb8OJlqZ9wwpXzWPEsvsB1nvdUi6oYrHIkQ1Y/tMDnr1h4nczS0VB9Xykg==",
+      "license": "MIT"
+    },
     "node_modules/natural-compare": {
       "version": "1.4.0",
       "resolved": "https://registry.npmmirror.com/natural-compare/-/natural-compare-1.4.0.tgz",