feat: Automated Audio System & Royalty-Free Asset Integration (Phase 8 & 9)

- Added footstep_grass.wav, wood_chop.wav, forest_ambient.mp3
- Synchronized rhythm footsteps with walk animation frames
- Implemented proximity-based pond music modulation
- Updated SoundManager to prioritize high-quality assets

src/entities/Player.js

@@ -450,6 +450,23 @@ class Player {
                     if (this.sprite.anims.currentAnim) {
                         this.sprite.anims.currentAnim.frameRate = frameRate;
                     }
+
+                    // 🔉 PHASE 8: Footstep triggers (frames 1 and 3 are usually down-steps)
+                    const currentFrame = this.sprite.anims.currentFrame ? this.sprite.anims.currentFrame.index : 0;
+                    if ((currentFrame === 1 || currentFrame === 3) && this.lastFootstepFrame !== currentFrame) {
+                        if (this.scene.soundManager) {
+                            // Determine surface
+                            let surface = 'grass';
+                            if (this.scene.terrainSystem && this.scene.terrainSystem.getTile) {
+                                const tile = this.scene.terrainSystem.getTile(this.gridX, this.gridY);
+                                if (tile && tile.type === 'dirt') surface = 'dirt';
+                            }
+                            this.scene.soundManager.playFootstep(surface);
+                        }
+                        this.lastFootstepFrame = currentFrame;
+                    } else if (currentFrame !== 1 && currentFrame !== 3) {
+                        this.lastFootstepFrame = -1;
+                    }
                 }
             }
 
@@ -773,6 +790,8 @@ class Player {
                 const used = this.scene.statusEffectSystem.applyEffect('high');
                 if (used) {
                     invSys.removeItem(slot.type, 1);
+                    // Audio feedback
+                    if (this.scene.soundManager) this.scene.soundManager.playSmokeSound();
                     // Visual feedback
                     this.createSmokeParticles(this.gridX, this.gridY);
                     this.scene.events.emit('show-floating-text', {