Import art/VFX asset packs + game-feel systems; normalize texture extensions to lowercase for LFS

Add BefourStudios SciFi environment packs, Gabriel Aguiar VFX, and the
ShaderCrew Toon Shader embedded packages, plus combat/enemy/wave/death
gameplay systems and supporting vault docs/screenshots.

Rename 11 vendor textures from uppercase .PNG/.HDR to lowercase so the
case-sensitive Git LFS filters (*.png/*.hdr) match on case-sensitive
filesystems (Linux CI, case-sensitive macOS), not just locally where
core.ignorecase=true masks the gap. Each .meta moved with its asset so
GUID references are preserved. All ~1000 binaries tracked via LFS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/_Project/Scripts/Client/ProjectM.Client.asmdef

@@ -11,7 +11,8 @@
         "Unity.NetCode",
         "Unity.Entities.Graphics",
         "Unity.InputSystem",
-        "Unity.Networking.Transport"
+        "Unity.Networking.Transport",
+        "UnityEngine.UI"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],