feat(document-templates): delete TipTap-to-pdfme bridge

Phase 1 / commit 12 of 14 — strips out the 571-line tiptap-to-pdfme
serializer and every code path that depended on it. TipTap document
templates remain as Documenso-template seed bodies; the CRM no longer
renders them to PDF in-app.

Deleted:
  src/lib/pdf/tiptap-to-pdfme.ts                                (571 LOC)
  src/lib/pdf/templates/eoi-standard-inapp.ts                   (337 LOC)
  src/app/api/v1/admin/templates/preview/route.ts
  src/app/api/v1/document-templates/[id]/generate/route.ts
  src/app/api/v1/document-templates/[id]/generate-and-send/route.ts
  src/lib/services/document-templates.ts:generateFromTemplate (~140 LOC)
  src/lib/services/document-templates.ts:generateAndSend       (~40 LOC)
  src/lib/validators/document-templates.ts:generateAndSendSchema
  src/lib/validators/document-templates.ts:previewAdminTemplateSchema
  tests/unit/tiptap-serializer.test.ts (old bridge tests)

Preserved as src/lib/pdf/tiptap-validation.ts (~70 LOC):
  - validateTipTapDocument()  — still used to reject unsupported nodes
    on save in the admin template editor
  - TEMPLATE_VARIABLES        — drives the merge-token picker in the
    admin template form + preview UI

generateAndSign() now throws a clear ValidationError when a non-EOI
template tries the in-app pathway. Use a Documenso template, or wait
for the deferred AcroForm-fill admin-upload feature.

seed-data.ts: "Standard EOI (in-app)" template row now seeds with stub
bodyHtml + small MERGE_FIELDS array; the deleted HTML helper was never
actually rendered (in-app EOI is pdf-lib AcroForm fill on the source
PDF — generateEoiPdfFromTemplate, unchanged).

After this commit, pdfme has zero callers left. Commit 14 drops the
deps and the generate.ts shim.

1298/1298 vitest green.

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

src/lib/validators/document-templates.ts

@@ -63,10 +63,6 @@ export const generateSchema = z.object({
   berthId: z.string().optional(),
 });
 
-export const generateAndSendSchema = generateSchema.extend({
-  recipientEmail: z.string().email(),
-});
-
 export const generateAndSignSchema = generateSchema.extend({
   pathway: z.enum(['inapp', 'documenso-template']).default('inapp'),
   signers: z
@@ -86,7 +82,6 @@ export type CreateTemplateInput = z.infer<typeof createTemplateSchema>;
 export type UpdateTemplateInput = z.infer<typeof updateTemplateSchema>;
 export type ListTemplatesInput = z.infer<typeof listTemplatesSchema>;
 export type GenerateInput = z.infer<typeof generateSchema>;
-export type GenerateAndSendInput = z.infer<typeof generateAndSendSchema>;
 export type GenerateAndSignInput = z.infer<typeof generateAndSignSchema>;
 
 // ─── TipTap-based Admin Template Schemas ─────────────────────────────────────
@@ -113,11 +108,6 @@ export const updateAdminTemplateSchema = z.object({
   isActive: z.boolean().optional(),
 });
 
-export const previewAdminTemplateSchema = z.object({
-  content: z.record(z.string(), z.unknown()),
-  sampleData: z.record(z.string(), z.string()).optional(),
-});
-
 export const rollbackAdminTemplateSchema = z.object({
   version: z.number().int().min(1),
 });
@@ -132,6 +122,5 @@ export const listAdminTemplatesSchema = baseListQuerySchema.extend({
 
 export type CreateAdminTemplateInput = z.infer<typeof createAdminTemplateSchema>;
 export type UpdateAdminTemplateInput = z.infer<typeof updateAdminTemplateSchema>;
-export type PreviewAdminTemplateInput = z.infer<typeof previewAdminTemplateSchema>;
 export type RollbackAdminTemplateInput = z.infer<typeof rollbackAdminTemplateSchema>;
 export type ListAdminTemplatesInput = z.infer<typeof listAdminTemplatesSchema>;