Remove multi-tenant company_id scoping from entire codebase

Drop company_id column from all 22 domain tables via migration.
Remove companyId from JWT payload, auth plugins, all service method
signatures (~215 occurrences), all route handlers (~105 occurrences),
test runner, test suites, and frontend auth store/types.

The company table stays as store settings (name, timezone). Tenant
isolation in a SaaS deployment would be at the database level (one
DB per customer) not the application level.

All 107 API tests pass. Zero TSC errors across all packages.

packages/backend/src/db/schema/inventory.ts

@@ -9,13 +9,10 @@ import {
   numeric,
   date,
 } from 'drizzle-orm/pg-core'
-import { companies, locations } from './stores.js'
+import { locations } from './stores.js'
 
 export const categories = pgTable('category', {
   id: uuid('id').primaryKey().defaultRandom(),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   parentId: uuid('parent_id'),
   name: varchar('name', { length: 255 }).notNull(),
   description: text('description'),
@@ -27,9 +24,6 @@ export const categories = pgTable('category', {
 
 export const suppliers = pgTable('supplier', {
   id: uuid('id').primaryKey().defaultRandom(),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   name: varchar('name', { length: 255 }).notNull(),
   contactName: varchar('contact_name', { length: 255 }),
   email: varchar('email', { length: 255 }),
@@ -49,9 +43,6 @@ export const suppliers = pgTable('supplier', {
 
 export const products = pgTable('product', {
   id: uuid('id').primaryKey().defaultRandom(),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   locationId: uuid('location_id').references(() => locations.id),
   sku: varchar('sku', { length: 100 }),
   upc: varchar('upc', { length: 100 }),
@@ -79,9 +70,6 @@ export const inventoryUnits = pgTable('inventory_unit', {
   productId: uuid('product_id')
     .notNull()
     .references(() => products.id),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   locationId: uuid('location_id').references(() => locations.id),
   serialNumber: varchar('serial_number', { length: 255 }),
   condition: varchar('condition', { length: 100 }).notNull().default('new'),
@@ -112,9 +100,6 @@ export type Supplier = typeof suppliers.$inferSelect
 export type SupplierInsert = typeof suppliers.$inferInsert
 export const stockReceipts = pgTable('stock_receipt', {
   id: uuid('id').primaryKey().defaultRandom(),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   locationId: uuid('location_id').references(() => locations.id),
   productId: uuid('product_id')
     .notNull()
@@ -136,9 +121,6 @@ export const priceHistory = pgTable('price_history', {
   productId: uuid('product_id')
     .notNull()
     .references(() => products.id),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   previousPrice: numeric('previous_price', { precision: 10, scale: 2 }),
   newPrice: numeric('new_price', { precision: 10, scale: 2 }).notNull(),
   previousMinPrice: numeric('previous_min_price', { precision: 10, scale: 2 }),
@@ -158,9 +140,6 @@ export const consignmentDetails = pgTable('consignment_detail', {
   productId: uuid('product_id')
     .notNull()
     .references(() => products.id),
-  companyId: uuid('company_id')
-    .notNull()
-    .references(() => companies.id),
   consignorAccountId: uuid('consignor_account_id').notNull(),
   commissionPercent: numeric('commission_percent', { precision: 5, scale: 2 }).notNull(),
   minPrice: numeric('min_price', { precision: 10, scale: 2 }),