Revízny systém - kompletná implementácia

- Backend: CRUD revízií, schedule endpoint (agregovaný plán), skip revízia, stats
- Shared utility revisionSchedule.ts - centralizovaná logika výpočtu cyklov
- Equipment detail s revíznym plánom, históriou a prílohami
- Frontend: RevisionsList s tabmi (nadchádzajúce/po termíne/vykonané/preskočené)
- Pozičné labeling cyklov (eliminuje drift 4×90≠365)
- EquipmentRevisionSchedule model (many-to-many typy revízií)
- Aktualizovaná dokumentácia HELPDESK_INIT_V2.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/prisma/schema.prisma

@@ -109,7 +109,8 @@ model RevisionType {
   createdAt       DateTime  @default(now())
   updatedAt       DateTime  @updatedAt
 
-  revisions       Revision[]
+  revisions           Revision[]
+  equipmentSchedules  EquipmentRevisionSchedule[]
 
   @@index([active])
   @@index([order])
@@ -492,9 +493,10 @@ model Equipment {
   partNumber  String?
   serialNumber String?
 
-  installDate DateTime?
-  warrantyEnd DateTime?
-  warrantyStatus String?
+  installDate        DateTime?
+  revisionCycleStart DateTime?
+  warrantyEnd        DateTime?
+  warrantyStatus     String?
 
   description String?
   notes       String?
@@ -507,9 +509,10 @@ model Equipment {
   createdAt   DateTime  @default(now())
   updatedAt   DateTime  @updatedAt
 
-  revisions   Revision[]
-  attachments EquipmentAttachment[]
-  tags        EquipmentTag[]
+  revisions          Revision[]
+  revisionSchedules  EquipmentRevisionSchedule[]
+  attachments        EquipmentAttachment[]
+  tags               EquipmentTag[]
 
   @@index([typeId])
   @@index([customerId])
@@ -518,6 +521,22 @@ model Equipment {
   @@index([createdById])
 }
 
+model EquipmentRevisionSchedule {
+  id              String       @id @default(cuid())
+
+  equipmentId     String
+  equipment       Equipment    @relation(fields: [equipmentId], references: [id], onDelete: Cascade)
+
+  revisionTypeId  String
+  revisionType    RevisionType @relation(fields: [revisionTypeId], references: [id])
+
+  createdAt       DateTime     @default(now())
+
+  @@unique([equipmentId, revisionTypeId])
+  @@index([equipmentId])
+  @@index([revisionTypeId])
+}
+
 model Revision {
   id            String       @id @default(cuid())
 
@@ -527,6 +546,8 @@ model Revision {
   typeId        String
   type          RevisionType @relation(fields: [typeId], references: [id])
 
+  status        String       @default("performed")  // "performed" | "skipped"
+
   performedDate DateTime
   nextDueDate   DateTime?
 
@@ -536,6 +557,7 @@ model Revision {
   findings      String?
   result        String?
   notes         String?
+  skipReason    String?
 
   reminderSent  Boolean      @default(false)
   reminderDate  DateTime?
@@ -548,6 +570,7 @@ model Revision {
   @@index([performedById])
   @@index([nextDueDate])
   @@index([reminderDate])
+  @@index([status])
 }
 
 model EquipmentAttachment {