feat(host): build the process logger through the shared AddZbSerilog bootstrap (#94)

Switch ScadaBridge from its own LoggerConfigurationFactory to AddZbSerilog
(ZB.MOM.WW.Telemetry(.Serilog) 0.1.0 -> 0.2.0) using the two 0.2.0 hooks:

- MinimumLevelGovernor: ScadaBridge:Logging:MinimumLevel, applied after
  ReadFrom.Configuration so it outranks Serilog:MinimumLevel (never null, so the
  floor never defers to the Serilog key; Override:* namespace entries still apply;
  the one-shot conflict / unparseable-value warnings are unchanged).
- ConfigureLogger: the standby active-node exclusion filter (register row 71),
  the configured node identity (the shared bootstrap stamps NodeHostname from
  the machine name and skips empty values; an overwriting enricher keeps the
  configured ScadaBridge:Node values verbatim), Enrich.FromLogContext and the
  ExecutionLogCaptureSink.

ScadaBridgeLogging runs AddZbSerilog on a small pre-host builder and Program
installs the result as the static Log.Logger; both web hosts keep UseSerilog()
over it. One logger and one file-sink handle per process, usable before the
host is built (startup banner, warnings, pre-host Fatal), by SerilogAkkaLogger,
and after the host is disposed (shutdown line, unexpected-termination Fatal) —
AddZbSerilog's own DI registration would leave Log.Logger alone and have the
host dispose the logger.

LoggerConfigurationFactory is deleted (nothing else used it). Tests: existing
logging/standby/sink tests now run through the new pipeline, plus
ScadaBridgeLoggingParityTests (level precedence, Override:* still applies,
one-shot warning, configured identity incl. NodeHostname != MachineName and empty
SiteId, exact property set of a plain line, trace_id/span_id). Mutation-checked:
governor deferring, filter removed, identity enricher removed, FromLogContext
removed, capture sink removed each fail tests.

Claude-Session: https://claude.ai/code/session_01GT67ACmpMR7b9LGRPLijMi

docs/components/Host.md

@@ -16,7 +16,7 @@ The component code lives in `src/ZB.MOM.WW.ScadaBridge.Host/`, split across:
 - `SiteServiceRegistration.cs` — extracted site-role DI registrations reused by both `Program.cs` and integration test harnesses.
 - `StartupValidator.cs` — pre-DI configuration preflight that fails fast before any actor system is created.
 - `StartupRetry.cs` — bounded exponential-backoff helper for startup preconditions (database migrations).
-- `LoggerConfigurationFactory.cs` — builds the Serilog `LoggerConfiguration` with node-identity enrichment.
+- `ScadaBridgeLogging.cs` — builds the process Serilog logger through the shared `AddZbSerilog` bootstrap (Telemetry.Serilog 0.2.0) with ScadaBridge's minimum-level governor and `ConfigureLogger` hook (standby active-node filter, configured node identity, LogContext, execution capture sink).
 
 ## Key Concepts