docs: update path references for module-folder reorganization

Rewrite src/ and tests/ project paths in docs, CLAUDE.md, README.md, and
test-fixture READMEs to the new module-folder layout (Core/Server/Drivers/
Client/Tooling). References to retired v1 projects (Galaxy.Host/Proxy/Shared,
the legacy monolithic test projects) are left untouched.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/v2/redundancy-interop-playbook.md

@@ -121,7 +121,7 @@ flips A4 from "deferred" to "expected pass").
   redundancy implementations we don't control.
 - For the sub-set of scenarios that *can* be automated — the self-loopback
   case where our own `otopcua-cli` drives Primary + Backup — the existing
-  `tests/ZB.MOM.WW.OtOpcUa.Server.Tests/RedundancyStatePublisherTests` +
+  `tests/Server/ZB.MOM.WW.OtOpcUa.Server.Tests/RedundancyStatePublisherTests` +
   `ServiceLevelCalculatorTests` (unit) + `ClusterTopologyLoaderTests`
   (integration) already cover the math + data path. The wire-level assertion
   that the values actually land on the right OPC UA nodes is covered by