feat: scaffold app skeleton with config, ULID, health endpoints, compose stack (phase 1)

- internal .env loader (real env wins) + strictly validated config struct
- ULID package: 48-bit ms timestamp + 80-bit crypto randomness, sortable
- HTTP server with recovery/request-id/trusted-proxy/access-log middleware
- /healthz, /readyz (pluggable checkers), /metricsz (counter registry)
- multi-stage Dockerfile (alpine, non-root) + compose with healthchecks,
  app bound to 127.0.0.1:8787, mongo unpublished, graceful 15s shutdown

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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etalon
2026-06-12 18:10:30 +02:00
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# Progress
- Phase 1 (scaffold): repo layout, Makefile, .env loader + validated config, slog JSON, ULID pkg, trusted-proxy middleware, /healthz /readyz /metricsz, Dockerfile + compose (mongo+app, healthchecks, localhost-bound 8787), graceful shutdown — build/vet/tests green, smoke PASS.