feat: Add services, company documents, company timesheet export

- Add services table and CRUD endpoints (/api/services)
- Add company documents upload/download functionality
- Add company timesheet XLSX export endpoint
- Remove admin requirement from event routes (all authenticated users can manage events)
- Add service validators

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/db/schema.js

@@ -284,6 +284,32 @@ export const timeEntries = pgTable('time_entries', {
   updatedAt: timestamp('updated_at').defaultNow().notNull(),
 });
 
+// Company Documents table - dokumenty nahrané k firme
+export const companyDocuments = pgTable('company_documents', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  companyId: uuid('company_id').references(() => companies.id, { onDelete: 'cascade' }).notNull(),
+  fileName: text('file_name').notNull(), // unikátny názov súboru na disku
+  originalName: text('original_name').notNull(), // pôvodný názov súboru
+  filePath: text('file_path').notNull(), // cesta k súboru
+  fileType: text('file_type').notNull(), // MIME typ
+  fileSize: integer('file_size').notNull(), // veľkosť v bytoch
+  description: text('description'),
+  uploadedBy: uuid('uploaded_by').references(() => users.id, { onDelete: 'set null' }),
+  uploadedAt: timestamp('uploaded_at').defaultNow().notNull(),
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+});
+
+// Services table - služby ponúkané firmou
+export const services = pgTable('services', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  name: text('name').notNull(),
+  price: text('price').notNull(), // stored as text for flexibility with decimal
+  description: text('description'),
+  createdBy: uuid('created_by').references(() => users.id, { onDelete: 'set null' }),
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+  updatedAt: timestamp('updated_at').defaultNow().notNull(),
+});
+
 // Messages table - interná komunikácia medzi používateľmi
 export const messages = pgTable('messages', {
   id: uuid('id').primaryKey().defaultRandom(),