fix: 优化架构

engine/prompt_injector.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from typing import Any
+
+
+def inject_prompt(global_cfg: dict[str, Any] | None, scene: dict[str, Any]) -> dict[str, str]:
+    """
+    Unified positive/negative prompt builder.
+    Note: current pipeline already injects some globals into `scene["image_prompt"]`.
+    """
+    global_cfg = global_cfg or {}
+    character = str(global_cfg.get("character", "") or "").strip()
+    style = str(global_cfg.get("style", "") or "").strip()
+    negative = str(global_cfg.get("negative_prompt", "") or "").strip()
+
+    base = str(scene.get("prompt") or scene.get("image_prompt") or "").strip()
+    if not base:
+        base = str(scene.get("image_prompt") or "")
+
+    positive_parts = [p for p in [character, style, base] if p]
+    positive = ", ".join(positive_parts).strip(", ")
+    return {"positive": positive, "negative": negative}
+