feat(eoi): in-app pathway fills the same source PDF as Documenso

When the in-app pathway is used for EOI templates, we now load the same
source PDF that the Documenso template uploads and fill its AcroForm
fields with values from EoiContext via pdf-lib. Field names mirror the
Documenso template's formValues keys exactly (Name, Email, Address,
Yacht Name, Length, Width, Draft, Berth Number + Lease_10 / Purchase
checkboxes), so both pathways produce equivalent legal documents — only
the renderer differs.

The form is left interactive (not flattened) so a recipient can still
adjust values before signing. Non-EOI templates (welcome letters,
acknowledgments, etc.) keep using the existing HTML→pdfme path.

Adds:
- pdf-lib direct dep
- src/lib/pdf/fill-eoi-form.ts — load + fill helpers, EOI_TEMPLATE_PDF_PATH
  env override
- assets/ + README documenting the expected source PDF
- next.config outputFileTracingIncludes so the asset is bundled in the
  standalone build

Tests: 8 new (4 fill-form unit + 2 source-PDF route + 2 fallback);
645/645 green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pnpm-lock.yaml

@@ -152,6 +152,9 @@ importers:
       openai:
         specifier: ^6.27.0
         version: 6.27.0(ws@8.18.3)(zod@3.25.76)
+      pdf-lib:
+        specifier: ^1.17.1
+        version: 1.17.1
       pino:
         specifier: ^9.5.0
         version: 9.14.0
@@ -4417,6 +4420,9 @@ packages:
   pathe@2.0.3:
     resolution: {integrity: sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==}
 
+  pdf-lib@1.17.1:
+    resolution: {integrity: sha512-V/mpyJAoTsN4cnP31vc0wfNA1+p20evqqnap0KLoRUN0Yk/p3wN52DOEsL4oBFcLdb76hlpKPtzJIgo67j/XLw==}
+
   peberminta@0.9.0:
     resolution: {integrity: sha512-XIxfHpEuSJbITd1H3EeQwpcZbTLHc+VVr8ANI9t5sit565tsI4/xK3KWTUFE2e6QiangUkh3B0jihzmGnNrRsQ==}
 
@@ -5375,6 +5381,9 @@ packages:
   tsconfig-paths@3.15.0:
     resolution: {integrity: sha512-2Ac2RgzDe/cn48GvOe3M+o82pEFewD3UPbyoUHHdKasHwJKjds4fLXWf/Ux5kATBKN20oaFGu+jbElp1pos0mg==}
 
+  tslib@1.14.1:
+    resolution: {integrity: sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==}
+
   tslib@2.8.1:
     resolution: {integrity: sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==}
 
@@ -9668,6 +9677,13 @@ snapshots:
 
   pathe@2.0.3: {}
 
+  pdf-lib@1.17.1:
+    dependencies:
+      '@pdf-lib/standard-fonts': 1.0.0
+      '@pdf-lib/upng': 1.0.1
+      pako: 1.0.11
+      tslib: 1.14.1
+
   peberminta@0.9.0: {}
 
   performance-now@2.1.0: {}
@@ -10843,6 +10859,8 @@ snapshots:
       minimist: 1.2.8
       strip-bom: 3.0.0
 
+  tslib@1.14.1: {}
+
   tslib@2.8.1: {}
 
   tsx@4.21.0: