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/server/routers/project.ts

@@ -84,7 +84,9 @@ export const projectRouter = router({
       const skip = (page - 1) * perPage
 
       // Build where clause
-      const where: Record<string, unknown> = {}
+      const where: Record<string, unknown> = {
+        isTest: false,
+      }
 
       // Filter by program
       if (programId) where.programId = programId
@@ -219,7 +221,9 @@ export const projectRouter = router({
         wantsMentorship, hasFiles, hasAssignments,
       } = input
 
-      const where: Record<string, unknown> = {}
+      const where: Record<string, unknown> = {
+        isTest: false,
+      }
 
       if (programId) where.programId = programId
       if (roundId) {
@@ -357,19 +361,19 @@ export const projectRouter = router({
     .query(async ({ ctx }) => {
       const [countries, categories, issues] = await Promise.all([
         ctx.prisma.project.findMany({
-          where: { country: { not: null } },
+          where: { isTest: false, country: { not: null } },
           select: { country: true },
           distinct: ['country'],
           orderBy: { country: 'asc' },
         }),
         ctx.prisma.project.groupBy({
           by: ['competitionCategory'],
-          where: { competitionCategory: { not: null } },
+          where: { isTest: false, competitionCategory: { not: null } },
           _count: true,
         }),
         ctx.prisma.project.groupBy({
           by: ['oceanIssue'],
-          where: { oceanIssue: { not: null } },
+          where: { isTest: false, oceanIssue: { not: null } },
           _count: true,
         }),
       ])
@@ -838,7 +842,7 @@ export const projectRouter = router({
     )
     .mutation(async ({ ctx, input }) => {
       const projects = await ctx.prisma.project.findMany({
-        where: { id: { in: input.ids } },
+        where: { id: { in: input.ids }, isTest: false },
         select: { id: true, title: true, status: true },
       })
 
@@ -948,11 +952,13 @@ export const projectRouter = router({
       programId: z.string().optional(),
     }))
     .query(async ({ ctx, input }) => {
-      const where: Record<string, unknown> = {}
+      const where: Record<string, unknown> = {
+        isTest: false,
+      }
       if (input.programId) where.programId = input.programId
 
       const projects = await ctx.prisma.project.findMany({
-        where: Object.keys(where).length > 0 ? where : undefined,
+        where,
         select: { tags: true },
       })
 
@@ -984,6 +990,7 @@ export const projectRouter = router({
       const projects = await ctx.prisma.project.findMany({
         where: {
           id: { in: input.ids },
+          isTest: false,
         },
         select: { id: true, title: true },
       })
@@ -1102,6 +1109,7 @@ export const projectRouter = router({
 
       const where: Record<string, unknown> = {
         programId,
+        isTest: false,
         projectRoundStates: { none: {} }, // Projects not assigned to any round
       }