fix(writer): map_template consumes real ParsedTemplate sections (positional section ids)

src/genesis/writer/template_mapper.py

@@ -1,22 +1,36 @@
-"""模板 → 有序章节规格映射（Phase 5）。"""
+"""模板 → 有序章节规格映射（Phase 5）。
+
+真实 ParsedTemplate.sections 为 ChapterMarker 列表；章节由 type=="heading" 起，
+紧随其后的 type=="placeholder" 且形如 `section:<id>` 的标记归属该章，
+用于确定 chapter_id 与 section_placeholder（语言无关、按文档顺序）。
+"""
 from __future__ import annotations
 
+import re
+
+from genesis.data_models import ParsedTemplate
 from genesis.writer.models import ChapterSpec
 
+_SECTION_RE = re.compile(r"^section:(.+)$")
 
-def map_template(parsed) -> list[ChapterSpec]:
-    """按模板 Heading 层级顺序产出有序章节列表。
 
-    `parsed.chapters` 为 WordTemplateParser 产出的章节标记列表，
-    每项含 chapter_id / title / section_placeholder 属性。
-    """
+def map_template(parsed: ParsedTemplate) -> list[ChapterSpec]:
     specs: list[ChapterSpec] = []
-    for ch in getattr(parsed, "chapters", []):
-        specs.append(
-            ChapterSpec(
-                chapter_id=getattr(ch, "chapter_id", ""),
-                title=getattr(ch, "title", ""),
-                section_placeholder=getattr(ch, "section_placeholder", None),
+    idx = 0
+    current: ChapterSpec | None = None
+    for ch in getattr(parsed, "sections", []):
+        t = getattr(ch, "type", None)
+        if t == "heading":
+            idx += 1
+            current = ChapterSpec(
+                chapter_id=f"chapter_{idx}", title=getattr(ch, "name", ""), section_placeholder=None
             )
-        )
+            specs.append(current)
+        elif t == "placeholder" and current is not None:
+            m = _SECTION_RE.match(getattr(ch, "name", ""))
+            if m:
+                sid = m.group(1)
+                current.section_placeholder = getattr(ch, "name", "")
+                if current.chapter_id.startswith("chapter_"):
+                    current.chapter_id = sid
     return specs