FRE-588: Complete tRPC/Clerk integration with database schema updates

- Updated router.ts middleware for Clerk authentication
- Modified test contexts to use clerkUserId
- Added team tables to test schema
- Updated WaitlistForm and waitlist page
- Created src/server/trpc/ parallel structure

All 258 tests pass. Ready for Security Reviewer.

server/trpc/character-router.test.ts

@@ -11,7 +11,7 @@ describe('tRPC API Layer - Character System', () => {
   beforeEach(async () => {
     await resetTestDb();
     const db = await getTestDb();
-    ctx = { userId: 1, db };
+    ctx = { clerkUserId: 'user_test', db };
     caller = appRouter.createCaller(ctx);
 
     const project = await caller.project.createProject({