feat(jump-hop): optimize generated assets and runtime background

server-rs/crates/spacetime-module/src/jump_hop.rs

@@ -1179,7 +1179,7 @@ fn default_config_from_seed(seed_text: &str) -> JumpHopCreatorConfigSnapshot {
         difficulty: JumpHopDifficulty::Standard.as_str().to_string(),
         style_preset: JUMP_HOP_STYLE_MINIMAL_BLOCKS.to_string(),
         character_prompt: "内置默认 3D 角色".to_string(),
-        tile_prompt: format!("{seed}主题的俯视角清爽游戏化立体感平台素材"),
+        tile_prompt: format!("{seed}主题的正面30度视角主题物体图集，物体本身作为跳跃落点"),
         end_mood_prompt: String::new(),
     }
 }