Add repair notes journal with running feed, visibility, and status tagging

New repair_note table for timestamped journal entries on tickets. Each
note captures author, content, visibility (internal or customer-facing),
and the ticket status at time of writing. Notes display as a running
feed on the ticket detail page with newest first. Internal notes have
a lock icon, customer-visible notes highlighted in blue. Supports add
and delete with appropriate permission gating.

packages/shared/src/schemas/repairs.schema.ts

@@ -97,6 +97,17 @@ export const RepairBatchStatusUpdateSchema = z.object({
 })
 export type RepairBatchStatusUpdateInput = z.infer<typeof RepairBatchStatusUpdateSchema>
 
+// --- Repair Note schemas ---
+
+export const RepairNoteVisibility = z.enum(['internal', 'customer'])
+export type RepairNoteVisibility = z.infer<typeof RepairNoteVisibility>
+
+export const RepairNoteCreateSchema = z.object({
+  content: z.string().min(1),
+  visibility: RepairNoteVisibility.default('internal'),
+})
+export type RepairNoteCreateInput = z.infer<typeof RepairNoteCreateSchema>
+
 // --- Repair Service Template schemas ---
 
 export const RepairServiceTemplateCreateSchema = z.object({