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/Materials/M_Projectile.mat

@@ -11,9 +11,10 @@ Material:
   m_Shader: {fileID: 4800000, guid: 933532a4fcc9baf4fa0491de14d08ed7, type: 3}
   m_Parent: {fileID: 0}
   m_ModifiedSerializedProperties: 0
-  m_ValidKeywords: []
+  m_ValidKeywords:
+  - _EMISSION
   m_InvalidKeywords: []
-  m_LightmapFlags: 4
+  m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
   m_CustomRenderQueue: -1
@@ -116,9 +117,9 @@ Material:
     - _XRMotionVectorsPass: 1
     - _ZWrite: 1
     m_Colors:
-    - _BaseColor: {r: 1, g: 0.85, b: 0.1, a: 1}
-    - _Color: {r: 1, g: 0.85, b: 0.09999997, a: 1}
-    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _BaseColor: {r: 0.85, g: 1, b: 1, a: 1}
+    - _Color: {r: 0.85, g: 1, b: 1, a: 1}
+    - _EmissionColor: {r: 1.4, g: 3.4, b: 3.8, a: 1}
     - _SpecColor: {r: 0.19999996, g: 0.19999996, b: 0.19999996, a: 1}
   m_BuildTextureStacks: []
   m_AllowLocking: 1