feat(opcuaclient): #676 follow-ups — endpoint rewrite, stall wire test, fast definitive-loss recovery

- Endpoint rewrite: the driver now connects to the configured host AND port (scheme
  match, advertised path kept) instead of the server-advertised URL — fixes NAT/port-map
  upstreams and lets an in-test proxy carry the session (SDK SelectEndpoint rule).
- TcpStallProxy + OpcUaClientDriverStallWireTests: the in-place blip (#670) is now
  wire-tested on loopback — one Bad, frozen read stamp, same session, identical value
  republished Good, a post-recovery change arrives, no source-time regression after
  the SDK's late backlog flush.
- Defect found by that test, fixed: a change published right after a stall rode a
  Publish response the SDK timed out and never republished, leaving the node Good on
  the pre-change value indefinitely. New trailing reconcile read (Timeout +
  KeepAliveInterval after recovery) publishes any Good value newer than the last
  accepted one, through the replay guard's mark.
- IDriverConnectionLossSource (Core.Abstractions): opt-in definitive-loss signal.
  DriverInstanceActor attaches in PreStart / detaches in PostStop and turns a raise
  into a disconnect only while Connected. OpcUaClient raises once per session on
  keep-alive BadSessionIdInvalid/BadSessionClosed/BadSessionNotActivated/
  BadServerHalted (measured: the SDK never re-opens a halted channel) or a dropped
  subscription; ambiguous codes stay with the #527 watchdog.
- Replay guard: one Information summary per recovery when the window closes
  ("dropped N late notifications across M refs"), with a timer so quiet
  subscriptions log it too.
- ReconnectPeriod deleted (options, AdminUI form, docs, tests); stored configs that
  carry reconnectPeriod still parse in the factory, probe and browser.
- Docs: OpcUaClient.md, DriverLifecycle.md, driver-specs.md, CLAUDE.md.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Drivers/Forms/OpcUaClientDriverForm.razor

@@ -53,11 +53,6 @@
                 <InputNumber @bind-Value="_form.OpcUa.KeepAliveIntervalSeconds" @bind-Value:after="EmitAsync" class="form-control form-control-sm" />
                 <div class="form-text">Default 5 s.</div>
             </div>
-            <div class="col-md-3">
-                <label class="form-label">Reconnect period (s)</label>
-                <InputNumber @bind-Value="_form.OpcUa.ReconnectPeriodSeconds" @bind-Value:after="EmitAsync" class="form-control form-control-sm" />
-                <div class="form-text">Initial delay after session drop. Default 5 s.</div>
-            </div>
             <div class="col-md-3">
                 <label class="form-label">Max discovered nodes</label>
                 <InputNumber @bind-Value="_form.OpcUa.MaxDiscoveredNodes" @bind-Value:after="EmitAsync" class="form-control form-control-sm" />
@@ -330,7 +325,6 @@
         public int TimeoutSeconds { get; set; } = 10;
         public int SessionTimeoutSeconds { get; set; } = 120;
         public int KeepAliveIntervalSeconds { get; set; } = 5;
-        public int ReconnectPeriodSeconds { get; set; } = 5;
         public int MaxDiscoveredNodes { get; set; } = 10_000;
         public int MaxBrowseDepth { get; set; } = 10;
 
@@ -370,7 +364,6 @@
             TimeoutSeconds = (int)r.Timeout.TotalSeconds,
             SessionTimeoutSeconds = (int)r.SessionTimeout.TotalSeconds,
             KeepAliveIntervalSeconds = (int)r.KeepAliveInterval.TotalSeconds,
-            ReconnectPeriodSeconds = (int)r.ReconnectPeriod.TotalSeconds,
             MaxDiscoveredNodes = r.MaxDiscoveredNodes,
             MaxBrowseDepth = r.MaxBrowseDepth,
             SecurityMode = r.SecurityMode,
@@ -404,7 +397,6 @@
             Timeout = TimeSpan.FromSeconds(TimeoutSeconds),
             SessionTimeout = TimeSpan.FromSeconds(SessionTimeoutSeconds),
             KeepAliveInterval = TimeSpan.FromSeconds(KeepAliveIntervalSeconds),
-            ReconnectPeriod = TimeSpan.FromSeconds(ReconnectPeriodSeconds),
             MaxDiscoveredNodes = MaxDiscoveredNodes,
             MaxBrowseDepth = MaxBrowseDepth,
             SecurityMode = SecurityMode,