MGS Origins Expanded 3.5.3 — Custom VFX

This build adds a server-side visual effects layer on top of the 3.5 engine.
No TEcho dependency is introduced.

VFX:
- Stealth: subtle olive/gold ground ring + smoke.
- Crawl: low green tactical ring.
- High Combat Heat: red heat ring + flame/smoke burst.
- The End Recon: gold scan ring every second; hostile targets receive a red target pulse and vanilla GLOW remains 5 seconds.
- Melee: profile-colored impact burst + CRIT particles; Raiden/Sam/Gray Fox also get sweep particles.
- Projectile fire: muzzle smoke + crit burst.
- Damage taken: orange impact burst.
- Kill: profile-colored finisher burst + totem particles.

Pixel-art assets are included under assets/mgscanon/textures/mgs_effects/ and can be used by a future HUD/effect screen.
The visuals intentionally use a muted tactical palette inspired by the supplied pixel-art references.
