feat: update deno.json and deno.lock to include OpenAI and Zod imports; add sample PDF file

- Added imports for OpenAI and Zod in deno.json
- Updated deno.lock with new versions for OpenAI and Zod
- Introduced a sample PDF file demonstrating bookmark functionality
- Refactored ai-structured function to improve error handling and logging
- Updated tests to reflect changes in input structure and expected output

deno.lock

@@ -2,21 +2,30 @@
   "version": "5",
   "specifiers": {
     "jsr:@openai/openai@*": "6.9.0",
+    "jsr:@openai/openai@^6.16.0": "6.16.0",
     "jsr:@std/assert@1": "1.0.16",
     "jsr:@std/dotenv@*": "0.225.6",
     "jsr:@std/internal@^1.0.12": "1.0.12",
     "jsr:@supabase/functions-js@*": "2.90.1",
+    "jsr:@zod/zod@^4.3.5": "4.3.5",
     "npm:@supabase/supabase-js@^2.90.1": "2.90.1",
     "npm:@types/bun@^1.3.5": "1.3.5",
     "npm:deno@^2.6.4": "2.6.4",
     "npm:openai@^6.16.0": "6.16.0",
     "npm:supabase-js@^1.0.4": "1.0.4",
-    "npm:supabase@^2.72.6": "2.72.6"
+    "npm:supabase@^2.72.6": "2.72.6",
+    "npm:zod@3": "3.25.76"
   },
   "jsr": {
     "@openai/openai@6.9.0": {
       "integrity": "d1828101f5a782a75c25805c4e06c1316d9c19f422d84755fb908046184c3ef6"
     },
+    "@openai/openai@6.16.0": {
+      "integrity": "ccee548f61c382d715091fff0c2c3390a4487823644430b8235df543d6d6a78b",
+      "dependencies": [
+        "npm:zod"
+      ]
+    },
     "@std/assert@1.0.16": {
       "integrity": "6a7272ed1eaa77defe76e5ff63ca705d9c495077e2d5fd0126d2b53fc5bd6532",
       "dependencies": [
@@ -31,6 +40,9 @@
     },
     "@supabase/functions-js@2.90.1": {
       "integrity": "9a077ecf42aa84594ef3aac621d643e15ffaa9506a4c051e35c93f127ffdb035"
+    },
+    "@zod/zod@4.3.5": {
+      "integrity": "3d14553f025d6e3d1a836b9c56e366bbce27d942301e8c7c1ac4c365df5f8085"
     }
   },
   "npm": {
@@ -294,9 +306,16 @@
     },
     "yallist@5.0.0": {
       "integrity": "sha512-YgvUTfwqyc7UXVMrB+SImsVYSmTS8X/tSrtdNZMImM+n7+QTriRXyXim0mBrTXNeqzVF0KWGgHPeiyViFFrNDw=="
+    },
+    "zod@3.25.76": {
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ=="
     }
   },
   "workspace": {
+    "dependencies": [
+      "jsr:@openai/openai@^6.16.0",
+      "jsr:@zod/zod@^4.3.5"
+    ],
     "packageJson": {
       "dependencies": [
         "npm:@supabase/supabase-js@^2.90.1",