feat: migrate DB error logging onto the generic OCORE MultiLogger SQL sink

Retires Fuchs_intranet.debug_log() and every direct EXECUTE [dbo].[fds__admin_logdebug]
call in favor of a single path: ILogger. A new SQL log sink (OCORE.MultiLogger.SqlLoggerProvider,
gated by Fuchs:Logging:SqlSink:Enabled, default on) mirrors every _logger.LogWarning/-Error/
-Critical call into [dbo].[fds__debuglog] via a new fds__admin_logdebug_ext proc, at Warning+.

- Program.cs registers the sink and RequestLogScopeMiddleware (request id/path/authenticated
  user, pushed after UseAuthentication) so every log line in a request — including ones written
  deep inside OCORE's SQL helpers — is attributed automatically.
- FIS_SQLOptions, IntranetController.Do's catch-all, PdfPreviewAsync, and the banking-upload
  handlers now log once, with an explicit EventId preserving the exact CodeReference text the
  retired debug_log() calls used to write, so existing dashboards/queries over fds__debuglog
  keep working unchanged.
- Fuchs_DataService/FdsMfr.cs's FdsSqlOptions had the identical double-write hazard (it's hosted
  in the same process per ADR 0010) — the original 2026-09-16 log review's mfr__getSchema/
  fds__getUpdateableRequests deadlock rows came from exactly this class. Fixed the same way.
- fds__debuglog gains LogLevel/Machine/Category/Account/AuthUser/IsDebug columns; the legacy
  fds__admin_logdebug proc is left in place unused, not dropped.
- FdsDebug.DebugLog (Fuchs_DataService's other ~9 call sites) deliberately left on its direct
  DB-write path — no ILogger call sits alongside it there, so no duplication risk today.

See ADR 0024 (supersedes 0023) and Docs/Concepts/error-logging-pipeline.md.

New tests: ErrorLoggingTests (FIS_SQLOptions), FdsSqlOptionsTests, RequestLogScopeMiddlewareTests.
694/694 pass (the 4 PdfPipelineTests failures seen under full-suite parallel runs are a
pre-existing, unrelated PdfSharp global-font-resolver test-isolation flake — they pass both
individually and in most full-suite runs).

Bumps the OCORE submodule to 3137b56 (SQL sink hardening: redaction matches short fragments
as whole identifier segments, per-entry-tolerant serialization, lazy dataSerialized, opt-in
SqlLoggerOptions.IncludeCategory, LogEntry.Category/AuthUser capture).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Fuchs_DataService/Fuchs_DataService.xml

@@ -6,11 +6,18 @@
     <members>
         <member name="T:fds.FdsSqlOptions">
             <summary>
-            Logs every SQL error both to the worker's structured <see cref="T:Microsoft.Extensions.Logging.ILogger"/> (so it reaches
-            whatever sink/OTel export is configured) and to <see cref="M:fds.FdsDebug.DebugLog(System.String,Microsoft.Data.SqlClient.SqlConnection,System.Exception,System.String,System.Object)"/> (SQL/local-file
-            debug trail). Passing <paramref name="logger"/> is optional for call sites that don't have one
-            in scope, but every caller that does have one in scope should pass it — otherwise a failing
-            stored procedure only ever shows up in the debug trail, never in the worker's own logs.
+            Logs every SQL error through the worker's structured <see cref="T:Microsoft.Extensions.Logging.ILogger"/> alone — which, when
+            this worker runs hosted inside the Fuchs web app (ADR 0010), also reaches the OCORE MultiLogger
+            SQL sink at Warning+ (ADR 0024) and lands in the same <c>fds__debuglog</c> table
+            <c>FdsDebug.DebugLog</c> used to write to directly. Calling both here would double-write
+            every row, which is exactly what the original 2026-09-16 log review's back-to-back
+            "mfr__getSchema"/"fds__getUpdateableRequests" deadlock entries were heading towards once the
+            SQL sink went live — so this class no longer calls <c>FdsDebug.DebugLog</c>. Passing a
+            <c>logger</c> is optional; falls back to the static <see cref="F:OCORE.Logging.Logger"/>
+            (set once in <c>Program.cs</c>) so a failing stored procedure is never silently dropped.
+            <c>FdsDebug.DebugLog</c> remains the primary/only DB-attribution path for every other
+            call site in this project that doesn't separately log through <see cref="T:Microsoft.Extensions.Logging.ILogger"/> — it was
+            deliberately not migrated onto the generic pipeline (see ADR 0024's Consequences).
             </summary>
         </member>
         <member name="F:fds.FdsMfr.InvoiceFileDownloadConcurrency">