fix: player life decrement and explosion animation bugs

Core

• Game loop (delta time)
• Collision detection (tank-tank, tank-wall, bullet-wall, bullet-tank, bullet-HQ)
• Boundary collision
• Tank movement/rotation/braking
• Bullet mechanics
• Enemy spawning
• Surface types (brick, steel, forest)
• Surface types (water, ice)
• Surface mechanics (ice sliding, water blocking)

Player

• Controls (keyboard)
• Lives/respawn
• Tank levels (0-3)
• Damage system (level down on hit)
• Bonuses (grenade, tank, star)
• Power-ups (bullet speed, reinforced bullets, bullet limit)
• Bonuses (helmet, timer, shovel)

Enemies

• Spawning system
• AI (Lua scripts)
• Level system (probability-based)
• Types (basic, fast, rapid fire, heavy)
• Heavy tank health overlay
• AI difficulty scaling

HQ

• Vulnerability/explosion
• Victory/defeat overlays
• Defeat screen
• Protection mechanics

UI

• Level selection
• Pause overlay
• Debug info (FPS, TPS, lives, enemies)
• HUD (lives, score)
• Main menu
• Game over screen
• Settings

Audio

• Sound effects
• Background music
• Engine loop
• Volume config

Infrastructure

• Clean Architecture
• Dependency injection
• Repository pattern
• Specs system
• Unit tests (collision, audio)
• Test coverage (>80%)
• CI/CD
• Performance profiling