feat: 试用过程中的细节优化

server/services/prompts/alibaba.py

@@ -96,12 +96,13 @@ def _prompt_ecommerce_detail(ctx: dict, style: dict, lang: str) -> str:
 
 def _prompt_size_chart(ctx: dict, style: 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 (
         f"Product size chart infographic for \"{ctx['title']}\": product shown in clean front and side views "
-        f"on light background, with thin measurement annotation lines (arrows) marking length, width and height, "
+        f"on light background, with thin measurement annotation lines (arrows) only for supplied dimensions, "
         f"measurement values rendered next to each line"
         + (f" (known specs: {dims})" if dims else "")
-        + f", small caption row, precise technical drawing aesthetic. {style['tone']}. "
+        + f". {annotation} Small caption row, precise technical drawing aesthetic. {style['tone']}. "
         f"{TEXT_RENDER[lang]} {QUALITY} {PRODUCT_REF_LOCK}"
     )
 
@@ -136,7 +137,8 @@ _PROMPT_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:
     """构造指定图类型的完整生图 prompt（主体参考语义）。
 
     extra: 方案项信息 {title, detail, prompt_hint}——custom 类型必需，
@@ -145,6 +147,15 @@ def build_prompt(type_id: str, ctx: dict, style_set: int, lang: str, extra: dict
     requirements: 生图要求（最高优先级，强制约束），置于 prompt 最前面，
     声明覆盖一切冲突指令，用户可在此输入强制要求。
     """
+    if requirements_exclusive:
+        return " ".join([
+            requirements_block(requirements),
+            "Execute only the strict requirements above. Do not add marketing layouts, captions, overlays, "
+            "props, default studio styling, or visible text unless explicitly requested.",
+            "Preserve the reference image exactly unless the strict requirements explicitly request a "
+            "specific change. When they do, make only that requested change and preserve everything else.",
+            "Do not make any change that was not explicitly required.",
+        ])
     style = resolve_style(style_set, style_prompt)
     extra = extra or {}
     if type_id == "custom":