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>

src/components/shared/impersonation-banner.tsx

@@ -0,0 +1,149 @@
+'use client'
+
+import { useSession } from 'next-auth/react'
+import { useRouter } from 'next/navigation'
+import { useState } from 'react'
+import { trpc } from '@/lib/trpc/client'
+import { Button } from '@/components/ui/button'
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu'
+import { ChevronDown, LogOut, UserCog } from 'lucide-react'
+import type { UserRole } from '@prisma/client'
+
+const ROLE_LABELS: Record<string, string> = {
+  JURY_MEMBER: 'Jury Member',
+  APPLICANT: 'Applicant',
+  MENTOR: 'Mentor',
+  OBSERVER: 'Observer',
+  AWARD_MASTER: 'Award Master',
+  PROGRAM_ADMIN: 'Program Admin',
+  SUPER_ADMIN: 'Super Admin',
+}
+
+const ROLE_LANDING: Record<string, string> = {
+  JURY_MEMBER: '/jury',
+  APPLICANT: '/applicant',
+  MENTOR: '/mentor',
+  OBSERVER: '/observer',
+  AWARD_MASTER: '/admin',
+  PROGRAM_ADMIN: '/admin',
+  SUPER_ADMIN: '/admin',
+}
+
+export function ImpersonationBanner() {
+  const { data: session, update } = useSession()
+  const router = useRouter()
+  const [switching, setSwitching] = useState(false)
+
+  // Only fetch test users when impersonating (realRole check happens server-side)
+  const { data: testEnv } = trpc.testEnvironment.status.useQuery(undefined, {
+    enabled: !!session?.user?.isImpersonating,
+    staleTime: 60_000,
+  })
+
+  if (!session?.user?.isImpersonating) return null
+
+  const currentRole = session.user.role
+  const currentName = session.user.impersonatedName || session.user.name || 'Unknown'
+
+  // Group available test users by role (exclude currently impersonated user)
+  const availableUsers = testEnv?.active
+    ? testEnv.users.filter((u) => u.id !== session.user.id)
+    : []
+
+  const roleGroups = availableUsers.reduce(
+    (acc, u) => {
+      const role = u.role as string
+      if (!acc[role]) acc[role] = []
+      acc[role].push(u)
+      return acc
+    },
+    {} as Record<string, typeof availableUsers>
+  )
+
+  async function handleSwitch(userId: string, role: UserRole) {
+    setSwitching(true)
+    await update({ impersonateUserId: userId })
+    router.push((ROLE_LANDING[role] || '/admin') as any)
+    router.refresh()
+    setSwitching(false)
+  }
+
+  async function handleStopImpersonation() {
+    setSwitching(true)
+    await update({ stopImpersonation: true })
+    router.push('/admin/settings' as any)
+    router.refresh()
+    setSwitching(false)
+  }
+
+  return (
+    <div className="fixed top-0 left-0 right-0 z-50 bg-amber-500 text-amber-950 shadow-md">
+      <div className="mx-auto flex items-center justify-between px-4 py-1.5 text-sm font-medium">
+        <div className="flex items-center gap-2">
+          <UserCog className="h-4 w-4" />
+          <span>
+            Viewing as <strong>{currentName}</strong>{' '}
+            <span className="rounded bg-amber-600/30 px-1.5 py-0.5 text-xs font-semibold">
+              {ROLE_LABELS[currentRole] || currentRole}
+            </span>
+          </span>
+        </div>
+
+        <div className="flex items-center gap-2">
+          {/* Quick-switch dropdown */}
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button
+                variant="ghost"
+                size="sm"
+                className="h-7 gap-1 bg-amber-600/20 text-amber-950 hover:bg-amber-600/40"
+                disabled={switching}
+              >
+                Switch Role
+                <ChevronDown className="h-3 w-3" />
+              </Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="end" className="w-56">
+              {Object.entries(roleGroups).map(([role, users]) => (
+                <div key={role}>
+                  <DropdownMenuLabel className="text-xs text-muted-foreground">
+                    {ROLE_LABELS[role] || role}
+                  </DropdownMenuLabel>
+                  {users.map((u) => (
+                    <DropdownMenuItem
+                      key={u.id}
+                      onClick={() => handleSwitch(u.id, u.role as UserRole)}
+                      disabled={switching}
+                    >
+                      <span className="truncate">{u.name || u.email}</span>
+                    </DropdownMenuItem>
+                  ))}
+                  <DropdownMenuSeparator />
+                </div>
+              ))}
+            </DropdownMenuContent>
+          </DropdownMenu>
+
+          {/* Return to admin */}
+          <Button
+            variant="ghost"
+            size="sm"
+            className="h-7 gap-1 bg-amber-600/20 text-amber-950 hover:bg-amber-600/40"
+            onClick={handleStopImpersonation}
+            disabled={switching}
+          >
+            <LogOut className="h-3 w-3" />
+            Return to Admin
+          </Button>
+        </div>
+      </div>
+    </div>
+  )
+}