chore: organize solution into module folders (Core/Server/Drivers/Client/Tooling)

Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.

- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
  the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
  mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
  integration, install).

Build green (0 errors); unit tests pass. Docs left for a separate pass.

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

src/Server/ZB.MOM.WW.OtOpcUa.Admin/appsettings.json

@@ -0,0 +1,32 @@
+{
+  "ConnectionStrings": {
+    "ConfigDb": "Server=localhost,14330;Database=OtOpcUaConfig;User Id=sa;Password=OtOpcUaDev_2026!;TrustServerCertificate=True;Encrypt=False;"
+  },
+  "Authentication": {
+    "Ldap": {
+      "Enabled": true,
+      "Server": "localhost",
+      "Port": 3893,
+      "UseTls": false,
+      "AllowInsecureLdap": true,
+      "SearchBase": "dc=lmxopcua,dc=local",
+      "ServiceAccountDn": "cn=serviceaccount,ou=svcaccts,dc=lmxopcua,dc=local",
+      "ServiceAccountPassword": "serviceaccount123",
+      "DisplayNameAttribute": "cn",
+      "GroupAttribute": "memberOf",
+      "GroupToRole": {
+        "ReadOnly": "ConfigViewer",
+        "ReadWrite": "ConfigEditor",
+        "AlarmAck": "FleetAdmin"
+      }
+    }
+  },
+  "Serilog": {
+    "MinimumLevel": "Information"
+  },
+  "Metrics": {
+    "Prometheus": {
+      "Enabled": true
+    }
+  }
+}