Implement structured logging, error alerting, and fix TypeScript test…

[Cedarich]

Closes #44

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Changes:

• Wire StructuredLoggerService into Nest bootstrap and PrismaService
• Enhance global error filter with correlation IDs and error alert webhook
• Add structured response and database logging with correlation metadata
• Update logging config (rotation, redaction, retention policies)
• Fix strict property initialization for document and API key DTOs
• Clean up custom validators and their specs to satisfy strict TS settings
• Remove stale Prisma enum usages in properties.service.spec and use string statuses
• Fix test DTO specs to be strict-null-safe (non-null assertions where appropriate)
• Ensure npm run test:unit passes with no TypeScript diagnostics

Verification:

• npm run test:unit
• TypeScript diagnostics: no remaining errors in src/ or test/

closes issues #10

[Cedarich]

please approve workflow @LaGodxy

[LaGodxy]

@Cedarich please fix CI