Add Anthropic API, test environment, remove locale settings

Feature 1: Anthropic API Integration
- Add @anthropic-ai/sdk with adapter wrapping OpenAI-shaped interface
- Support Claude models (opus, sonnet, haiku) with extended thinking
- Auto-reset model on provider switch, JSON retry logic
- Add Claude model pricing to ai-usage tracker
- Update AI settings form with Anthropic provider option

Feature 2: Remove Locale Settings UI
- Strip Localization tab from admin settings
- Remove i18n settings from router inferCategory and getFeatureFlags
- Keep franc document language detection intact

Feature 3: Test Environment with Role Impersonation
- Add isTest field to User, Program, Project, Competition models
- Test environment service: create/teardown with realistic dummy data
- JWT-based impersonation for test users (@test.local emails)
- Impersonation banner with quick-switch between test roles
- Test environment panel in admin settings (SUPER_ADMIN only)
- Email redirect: @test.local emails routed to admin with [TEST] prefix
- Complete data isolation: 45+ isTest:false filters across platform
  - All global queries on User/Project/Program/Competition
  - AI services blocked from processing test data
  - Cron jobs skip test rounds/users
  - Analytics/exports exclude test data
  - Admin layout/pickers hide test programs

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

prisma/migrations/20260221000000_add_test_isolation_anthropic_remove_locale/migration.sql

@@ -0,0 +1,27 @@
+-- Add isTest field to User, Program, Project, Competition for test environment isolation
+ALTER TABLE "User" ADD COLUMN "isTest" BOOLEAN NOT NULL DEFAULT false;
+ALTER TABLE "Program" ADD COLUMN "isTest" BOOLEAN NOT NULL DEFAULT false;
+ALTER TABLE "Project" ADD COLUMN "isTest" BOOLEAN NOT NULL DEFAULT false;
+ALTER TABLE "Competition" ADD COLUMN "isTest" BOOLEAN NOT NULL DEFAULT false;
+
+-- Index for efficient test data filtering
+CREATE INDEX "Competition_isTest_idx" ON "Competition"("isTest");
+
+-- Add provider field to AIUsageLog for cross-provider cost tracking
+ALTER TABLE "AIUsageLog" ADD COLUMN "provider" TEXT;
+
+-- Remove LOCALIZATION from SettingCategory enum
+-- First delete any rows using this category to avoid FK constraint errors
+DELETE FROM "SystemSettings" WHERE "category" = 'LOCALIZATION';
+
+-- Remove the enum value (PostgreSQL does not support DROP VALUE directly,
+-- so we recreate the enum type without the removed value)
+-- Step 1: Create new enum without LOCALIZATION
+CREATE TYPE "SettingCategory_new" AS ENUM ('AI', 'BRANDING', 'EMAIL', 'STORAGE', 'SECURITY', 'DEFAULTS', 'WHATSAPP', 'AUDIT_CONFIG', 'DIGEST', 'ANALYTICS', 'INTEGRATIONS', 'COMMUNICATION', 'FEATURE_FLAGS');
+
+-- Step 2: Alter column to use new enum
+ALTER TABLE "SystemSettings" ALTER COLUMN "category" TYPE "SettingCategory_new" USING ("category"::text::"SettingCategory_new");
+
+-- Step 3: Drop old enum and rename new one
+DROP TYPE "SettingCategory";
+ALTER TYPE "SettingCategory_new" RENAME TO "SettingCategory";

prisma/schema.prisma

@@ -101,7 +101,6 @@ enum SettingCategory {
   DEFAULTS
   WHATSAPP
   AUDIT_CONFIG
-  LOCALIZATION
   DIGEST
   ANALYTICS
   INTEGRATIONS
@@ -351,6 +350,9 @@ model User {
   preferredWorkload Int?
   availabilityJson  Json?  @db.JsonB // { startDate?: string, endDate?: string }
 
+  // Test environment isolation
+  isTest Boolean @default(false)
+
   createdAt   DateTime  @default(now())
   updatedAt   DateTime  @updatedAt
   lastLoginAt DateTime?
@@ -495,6 +497,9 @@ model Program {
   description  String?
   settingsJson Json?         @db.JsonB
 
+  // Test environment isolation
+  isTest Boolean @default(false)
+
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
@@ -619,6 +624,9 @@ model Project {
   metadataJson    Json?    @db.JsonB // Custom fields from Typeform, etc.
   externalIdsJson Json?    @db.JsonB // Typeform ID, Notion ID, etc.
 
+  // Test environment isolation
+  isTest Boolean @default(false)
+
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
@@ -907,7 +915,8 @@ model AIUsageLog {
   entityId   String?
 
   // What was used
-  model            String // gpt-4o, gpt-4o-mini, o1, etc.
+  provider         String? // 'openai', 'anthropic', 'litellm'
+  model            String // gpt-4o, gpt-4o-mini, o1, claude-sonnet-4-5, etc.
   promptTokens     Int
   completionTokens Int
   totalTokens      Int
@@ -2090,6 +2099,9 @@ model Competition {
   notifyOnDeadlineApproach Boolean @default(true)
   deadlineReminderDays     Int[]   @default([7, 3, 1])
 
+  // Test environment isolation
+  isTest Boolean @default(false)
+
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
@@ -2104,6 +2116,7 @@ model Competition {
 
   @@index([programId])
   @@index([status])
+  @@index([isTest])
 }
 
 model Round {