feat: add preprod observability foundation

docs/TASKS/observability/002-alerts-dashboard-hardening.md

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+# Observability 002: Alerts And Dashboard Hardening
+
+## Goal
+
+Make the preproduction observability stack actionable by adding alert rules, better operator dashboards, pinned image versions, and operational counters for services that commonly fail silently.
+
+## Feature Spec
+
+- `docs/FEATURES/observability.md`
+
+## Scope
+
+- Pin Grafana, Prometheus, Loki, Tempo, and Alloy image tags in the observability compose overlay.
+- Add Prometheus alert rules for API health, error rate, latency, usage silence, feedback bugs, email failures, blob failures, and background job failures.
+- Expand the Grafana dashboard with health, usage, operational failure, alert, log, and trace-oriented panels.
+- Add backend counters for email delivery, blob storage operations, and background job runs.
+- Document alerting and safe Grafana exposure expectations.
+
+## Out Of Scope
+
+- Notification delivery integration for alerts.
+- Client-facing status page.
+- Cloud observability backends.
+- Full product analytics or session tracking.
+
+## Validation
+
+```bash
+dotnet build backend/Socialize.slnx
+dotnet test backend/Socialize.slnx
+docker compose -f deploy/compose.yml -f deploy/observability/compose.observability.yml config
+```