feat(O-T4): extract ObjectMeshManager + mesh pipeline closure into AcDream.App.Rendering.Wb

Phase O Task 4: extract the WB mesh pipeline (ObjectMeshManager + 7 support files)
from references/WorldBuilder into src/AcDream.App/Rendering/Wb/ and bridge dat I/O
through our DatCollection via a thin DatCollectionAdapter.

O-D7 adapter path taken: ObjectMeshManager has 26 _dats.X call sites (threshold 20),
so a DatCollectionAdapter : IDatReaderWriter is introduced rather than refactoring
ObjectMeshManager's internal dat access directly.

Files added (verbatim copies, namespace-only changes):
- ObjectMeshManager.cs — mesh pipeline hub; IDatReaderWriter field satisfied by adapter
- GlobalMeshBuffer.cs — single global VAO/VBO/IBO manager
- EdgeLineBuilder.cs — wireframe edge geometry from CellStruct polygons
- ModernRenderData.cs — ModernBatchData + LandblockMdiCommand structs
- TextureAtlasManager.cs — texture array grouping by (Width, Height, Format)
- ParticleBatcher.cs — GPU particle batching; T4 interim uses BaseObjectRenderManager
  static fields from Chorizite.OpenGLSDLBackend.Lib (stays until T7)
- ParticleEmitterRenderer.cs — per-emitter particle lifecycle + rendering
- ActiveParticleEmitter.cs — wrapper holding renderer + part index + local offset
- DatCollectionAdapter.cs — NEW: bridges DatCollection → IDatReaderWriter; implements
  ResolveId() via DatDatabase.TypeFromId + Tree.TryGetFile in HighRes→Portal→Language→Cell
  order matching DefaultDatReaderWriter; DatDatabaseWrapper wraps DatDatabase as IDatDatabase

WbMeshAdapter.cs changes (T4 Step 6):
- _graphicsDevice switched from Chorizite.OpenGLSDLBackend.OpenGLGraphicsDevice to
  extracted AcDream.App.Rendering.Wb.OpenGLGraphicsDevice
- ParticleBatcher = new ParticleBatcher(_graphicsDevice) restored (T3 had null! placeholder)
- ObjectMeshManager now constructed with new DatCollectionAdapter(dats) instead of _wbDats
- _wbDats field + its construction + disposal + [indoor-upload] NULL_RESULT diagnostic block
  left intact — T7 cleanup removes these once WorldBuilder project ref is dropped

EmbeddedResourceReader.cs: replaced assembly manifest lookup (wrong prefix for our assembly)
with disk-based lookup mapping "Shaders.Particle.vert" → Rendering/Shaders/wb_particle.vert;
consistent with all other acdream shaders.

wb_particle.vert / wb_particle.frag: WB particle shaders copied verbatim with wb_ prefix
to distinguish from acdream's own particle.vert.

OpenGLGraphicsDevice.cs: ParticleBatcher property type updated to extracted ParticleBatcher;
setter changed from private to internal so WbMeshAdapter (same assembly) can assign post-ctor.

Build: green (0 errors, 0 warnings in AcDream.App).
Tests: 1147+8 baseline maintained (8 pre-existing failures unchanged).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/AcDream.App/Rendering/Wb/ActiveParticleEmitter.cs

@@ -0,0 +1,37 @@
+using System.Numerics;
+using Chorizite.OpenGLSDLBackend.Lib;
+using WorldBuilder.Shared.Models;
+
+namespace AcDream.App.Rendering.Wb {
+    public class ActiveParticleEmitter {
+        public ParticleEmitterRenderer Renderer { get; }
+        public uint PartIndex { get; }
+        public Matrix4x4 LocalOffset { get; }
+
+        // Store reference info instead of struct copy
+        public ObjectLandblock? ParentLandblock { get; set; }
+        public ObjectId? ParentInstanceId { get; set; }
+
+        public ActiveParticleEmitter(ParticleEmitterRenderer renderer, uint partIndex, Matrix4x4 localOffset, ObjectLandblock? parentLandblock = null, ObjectId? parentInstanceId = null) {
+            Renderer = renderer;
+            PartIndex = partIndex;
+            LocalOffset = localOffset;
+            ParentLandblock = parentLandblock;
+            ParentInstanceId = parentInstanceId;
+        }
+
+        public void Update(float deltaTime, Matrix4x4 parentTransform) {
+            Renderer.ParentTransform = parentTransform;
+            Renderer.LocalOffset = LocalOffset;
+            Renderer.Update(deltaTime);
+        }
+
+        public void Render(ParticleBatcher batcher) {
+            Renderer.Render(batcher);
+        }
+
+        public void Dispose() {
+            Renderer.Dispose();
+        }
+    }
+}