feat(13-01): implement aiCoordsToPagePdfSpace and AI field utilities

- Install openai 6.32.0 (npm package, listed in dependencies)
- Create src/lib/ai/extract-text.ts — pdfjs-dist legacy build server-side text extraction
  - extractPdfText(filePath) returning PageText[] with page, text, width, height
  - GlobalWorkerOptions.workerSrc = '' for Node.js fake-worker mode
  - Text per page capped at 2000 chars for GPT-4o-mini context limit
- Create src/lib/ai/field-placement.ts — GPT-4o-mini structured output + coord conversion
  - aiCoordsToPagePdfSpace() converts AI top-left pct coords to PDF bottom-left points
  - classifyFieldsWithAI() uses manual json_schema (NOT zodResponseFormat — broken with Zod v4)
  - Standard field sizes: checkbox=24x24pt, others=144x36pt
  - textFillData keyed by field UUID (not label) per Phase 12.1 design
- All 3 unit tests pass (GREEN phase confirmed)

teressa-copeland-homes/package-lock.json

@@ -21,6 +21,7 @@
         "next": "16.2.0",
         "next-auth": "5.0.0-beta.30",
         "nodemailer": "^7.0.13",
+        "openai": "^6.32.0",
         "postgres": "^3.4.8",
         "react": "19.2.4",
         "react-dom": "19.2.4",
@@ -11345,6 +11346,27 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/openai": {
+      "version": "6.32.0",
+      "resolved": "https://registry.npmjs.org/openai/-/openai-6.32.0.tgz",
+      "integrity": "sha512-j3k+BjydAf8yQlcOI7WUQMQTbbF5GEIMAE2iZYCOzwwB3S2pCheaWYp+XZRNAch4jWVc52PMDGRRjutao3lLCg==",
+      "license": "Apache-2.0",
+      "bin": {
+        "openai": "bin/cli"
+      },
+      "peerDependencies": {
+        "ws": "^8.18.0",
+        "zod": "^3.25 || ^4.0"
+      },
+      "peerDependenciesMeta": {
+        "ws": {
+          "optional": true
+        },
+        "zod": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",