feat: Hotfix Part1 - Backend support for company postal code, service tiers, timesheet naming

- Add postal_code column to companies table
- Add pricing_tiers column to services table for tiered pricing
- Update timesheet upload to generate filename in format {firstname}-{lastname}-timesheet-{date}

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

src/db/migrations/0008_add_company_postal_code.sql

@@ -0,0 +1,2 @@
+-- Add postal_code column to companies table
+ALTER TABLE "companies" ADD COLUMN IF NOT EXISTS "postal_code" text;

src/db/migrations/0009_add_service_pricing_tiers.sql

@@ -0,0 +1,2 @@
+-- Add pricing_tiers column to services table for tiered pricing
+ALTER TABLE "services" ADD COLUMN IF NOT EXISTS "pricing_tiers" text;

src/db/schema.js

@@ -126,6 +126,7 @@ export const companies = pgTable('companies', {
   description: text('description'),
   address: text('address'),
   city: text('city'),
+  postalCode: text('postal_code'),
   country: text('country'),
   phone: text('phone'),
   email: text('email'),
@@ -320,6 +321,7 @@ 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
+  pricingTiers: text('pricing_tiers'), // JSON array of tiers: [{tier: "Silver", price: "€149"}, ...]
   description: text('description'),
   createdBy: uuid('created_by').references(() => users.id, { onDelete: 'set null' }),
   createdAt: timestamp('created_at').defaultNow().notNull(),