feat(ugc): answer the client's UGC manifest requests without 3D services

With UGCUSE3DSERVICES=7:0 (the client's default) the client asks its world for
a blueprint file's MD5 and size (REQUEST_UGC_MANIFEST_INFO, world 27) and then
downloads BrickModels/UserMade/<id % 1000>/<id>.<ext>.sd0. Layouts checked in
the 1.10.64 client: the request is a u64 blueprint id and a u8 resource type;
the answer (UGC_MANIFEST_RESPONSE, client 60) repeats them and adds a u8 valid,
the u32 size and the 16 byte MD5 of the inflated file, 37 bytes after the 0x53
exactly or the client drops it.

- dNet: WorldPackets::RequestUgcManifestInfo, ClientPackets::UgcManifestResponse
  (eUgcResourceType), with byte tests against the client's layouts.
- Database: ugc_file_checksums (per model or module combination and file) and
  ugc_modular_build.combination_id (migrations 89 / 72), GetUgcFileChecksum
  looks a blueprint up as a model, else as a build through its combination.
- UGC server: every download is also written as .sd0 (Sd0::Compress); workers
  hand the checksums back and the main thread stores them; old items get their
  sd0 icon and checksum, and builds their combination id, once at start-up, a
  few per tick; serves <dir>/BrickModels/UserMade/<bucket>/<id>.<ext>.sd0 under
  client_path, /<folder>/UserBrickModels and the root (.hkx 404).
- World: UgcManifest answers on the main thread with one indexed query per
  request; files not made yet are answered when they are (looked at again
  every 5 seconds), and a model in its quiet period is made right away. No
  worker threads, HTTP or file reads in the world.

Off by default (ugc_manifest=0): checked in game, the client then downloads
from http://127.0.0.1:80/lwoclient/UserBrickModels/ whatever its boot.cfg says
and logs the player out when it can't connect, so icons need the UGC server on
port 80 of each player's machine. docs/UgcServer.md has the details.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dNet/WorldPackets.h

@@ -5,6 +5,7 @@
 #include "ChatPackets.h"
 #include "dCommonVars.h"
 #include "eFunnessTypes.h"
+#include "eUgcResourceType.h"
 #include "MessageType/Game.h"
 #include "MessageType/World.h"
 #include "PositionUpdate.h"
@@ -201,6 +202,17 @@ namespace WorldPackets {
 		bool Deserialize(RakNet::BitStream& bitStream) override;
 	};
 
+	// Client -> server, when its UGCUSE3DSERVICES is off (the default): the MD5 and size of one of a blueprint's files
+	// (a player's model, or a car or rocket's build), answered with ClientPackets::UgcManifestResponse.
+	struct RequestUgcManifestInfo : public WorldLUBitStream {
+		LWOOBJID blueprintId{};
+		eUgcResourceType resourceType{};
+
+		RequestUgcManifestInfo() : WorldLUBitStream(MessageType::World::REQUEST_UGC_MANIFEST_INFO) {}
+		void Serialize(RakNet::BitStream& bitStream) const override;
+		bool Deserialize(RakNet::BitStream& bitStream) override;
+	};
+
 	// Client -> server. The help screen wants its top 5 issues.
 	struct UIHelpTop5 : public WorldLUBitStream {
 		int32_t language{}; // 0: en_US, 1: pl_US, 2: de_DE, 3: en_GB