Add a global Nest ValidationPipe
Nest bootstrap entries should register `ValidationPipe` globally when controllers parse bodies or DTOs.
#Metadata
#Why it matters
Without a validation pipe unexpected fields can reach controllers and weaken input hygiene.
#Remediation
Call app.useGlobalPipes with ValidationPipe using whitelist and forbidNonWhitelisted flags near bootstrap completion.
#Repository path
The generated metadata points to critiq-rules/libs/rules/catalog/rules/typescript/ts.security.nestjs-missing-global-validation-pipe.rule.yaml.