fix: Resolve CI typecheck failures and improve type safety

Fixes CI pipeline failures caused by missing Prisma Client generation and TypeScript type safety issues. Added Prisma generation step to CI pipeline, installed missing type dependencies, and resolved 40+ exactOptionalPropertyTypes violations across service layer.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/api/src/auth/guards/auth.guard.ts

@@ -21,8 +21,12 @@ export class AuthGuard implements CanActivate {
         throw new UnauthorizedException("Invalid or expired session");
       }
 
-      // Attach user to request
-      request.user = sessionData.user;
+      // Attach user to request (with type assertion for session data structure)
+      const user = sessionData.user as unknown as AuthenticatedRequest["user"];
+      if (!user) {
+        throw new UnauthorizedException("Invalid user data in session");
+      }
+      request.user = user;
       request.session = sessionData.session;
 
       return true;