feat: 试用过程中的细节优化

server/services/prompts/gpt.py

@@ -129,12 +129,13 @@ def _task_ecommerce_detail(ctx: dict, lang: str) -> str:
 
 def _task_size_chart(ctx: dict, lang: str) -> str:
     dims = params_line_for_output(ctx, lang)
+    annotation = ctx.get("dimension_annotation_instruction") or "Do not invent measurement directions or values."
     return (
         "TASK: Measurement chart. Show the unchanged product in clean front and side views on a light "
-        "background; overlay thin technical annotation lines (arrows) marking length, width and height "
-        "with measurement values rendered beside each line"
+        "background; overlay thin technical annotation lines (arrows) only for the supplied dimensions, "
+        "with each measurement value rendered beside its line"
         + (f" (known specs: {dims})" if dims else "")
-        + "; precise technical-drawing aesthetic, small caption row."
+        + f". {annotation}; precise technical-drawing aesthetic, small caption row."
     )
 
 def _task_sku_collection(ctx: dict, lang: str) -> str:
@@ -160,8 +161,21 @@ _TASK_BUILDERS = {
 
 
 def build_prompt(type_id: str, ctx: dict, style_set: int, lang: str, extra: dict | None = None,
-                 style_prompt: str | None = None, requirements: str | None = None) -> str:
+                 style_prompt: str | None = None, requirements: str | None = None,
+                 requirements_exclusive: bool = False) -> str:
     """构造指定图类型的 edits 语义 prompt：要求块 → 编辑指令 → 保真锁 → 锚定 → 风格 → 文案 → 画质 → 终检。"""
+    if requirements_exclusive:
+        # 单张 AI 编辑：用户要求是唯一的画面意图，绝不能被套图的营销图/棚拍/俄文文案覆盖。
+        return "\n\n".join([
+            requirements_block(requirements),
+            "TASK: Edit Image 1 only according to the STRICT REQUIREMENTS above. Do not add marketing "
+            "layouts, captions, overlays, props, default studio styling, or any visible text unless the "
+            "STRICT REQUIREMENTS explicitly ask for them.",
+            "PROTECTION: preserve Image 1 exactly unless the STRICT REQUIREMENTS explicitly request a "
+            "specific change. When they do, make only that requested change and preserve everything else.",
+            "FINAL CHECK: follow the STRICT REQUIREMENTS over every default behavior. Preserve the product "
+            "and do not make any change that is not explicitly required.",
+        ])
     style = resolve_style(style_set, style_prompt)
     extra = extra or {}
     hint = (extra.get("prompt_hint") or "").strip()