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>

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Docker/profiles/s7_1500.json

@@ -0,0 +1,35 @@
+{
+  "_description": "S7-1500 profile — single DB1 (1024 bytes) + MB (256 bytes) with well-known seeds at named offsets for the smoke + byte-order + string tests. Big-endian Siemens wire order throughout.",
+  "areas": [
+    {
+      "area": "DB",
+      "index": 1,
+      "size": 1024,
+      "seeds": [
+        { "_desc": "DB1.DBW0 — read-back probe, S7Driver default ProbeAddress target is MW0; this shadows it",
+          "offset": 0, "type": "u16", "value": 4242 },
+        { "_desc": "DB1.DBW10 — i16 smoke value for SmokeI16 read path",
+          "offset": 10, "type": "i16", "value": -12345 },
+        { "_desc": "DB1.DBD20 — i32 smoke value for SmokeI32 read path",
+          "offset": 20, "type": "i32", "value": 1234567890 },
+        { "_desc": "DB1.DBD30 — f32 smoke value for SmokeF32 read path (IEEE-754 big-endian)",
+          "offset": 30, "type": "f32", "value": 3.14159 },
+        { "_desc": "DB1.DBX50.3 — bool bit at byte-50 bit-3 for SmokeBool read path",
+          "offset": 50, "type": "bool", "value": true, "bit": 3 },
+        { "_desc": "DB1.DBW100 — scratch for write-then-read round-trip tests; seeded 0",
+          "offset": 100, "type": "u16", "value": 0 },
+        { "_desc": "DB1.STRING[200] — S7 string 'Hello' (max 32, cur 5)",
+          "offset": 200, "type": "ascii", "value": "Hello", "max_len": 32 }
+      ]
+    },
+    {
+      "area": "MK",
+      "index": 0,
+      "size": 256,
+      "seeds": [
+        { "_desc": "MW0 — probe target for S7ProbeOptions.ProbeAddress default",
+          "offset": 0, "type": "u16", "value": 1 }
+      ]
+    }
+  ]
+}