Add real-time NewsLens search and ingestion platform

[triasha72]

What changed

• adds a Go ingestion API and two-member Kafka consumer group with keyed ordering, retry, dead-letter handling, and PostgreSQL idempotency
• adds FastAPI query understanding and transparent freshness-aware ranking
• adds Docker Compose, Prometheus, health checks, recovery/load/DLQ/ordering probes, and machine-readable local evidence
• extends the Docker Desktop Kubernetes evidence with HPA, ingress, disruption, and NetworkPolicy results
• rewrites the README, architecture, operations, API, deployment, decision, and roadmap documentation around what was built, why, how, and where the evidence stops

Verification

• full Python test suite passed
• Ruff passed
• Go tests and vet passed
• Docker Compose configuration passed
• 500/500 events accepted in the saved local run; 44 ms publish p99 and 79 ms sampled produced-to-indexed p95
• duplicate replay, stale-update ordering, dead-letter, targeted consumer recovery, and backlog recovery probes passed

Evidence boundary

The runtime measurements come from a single Docker Desktop host with one Kafka broker and one PostgreSQL instance. They are local implementation evidence, not a production capacity or multi-zone availability claim.