feat: 完成A线详细大纲

- 加入巫族首领摄司的设定（开放祖庭、贡献值制度）
- 修正人族演化路径：底层献祭品→贡献值→祖庭核心→导演终局
- 修正终局之战逻辑：人族制造假情报，坐收渔利
- 修正刑天结局：至死都是巫族，战死沙场
- 修正九黎阙设定：后期配角，主动被寄生50年后自爆
- 核心主题：人族成长=否定血脉论

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/dagang.json.template

@@ -0,0 +1,39 @@
+{
+  "novel_info": {
+    "title": "小说标题",
+    "genre": "类型（奇幻/科幻/都市/历史等）",
+    "target_length": "预计字数",
+    "theme": "核心主题"
+  },
+  "logline": "一句话故事梗概",
+  "story_arc": {
+    "opening": "开端描述",
+    "inciting_incident": "引发事件",
+    "rising_action": "上升动作（主要冲突发展）",
+    "climax": "高潮描述",
+    "resolution": "结局描述"
+  },
+  "main_characters": ["主角ID列表"],
+  "conflicts": [
+    {
+      "type": "内部/外部",
+      "description": "冲突描述",
+      "resolution": "如何解决"
+    }
+  ],
+  "chapter_outline": [
+    {
+      "chapter_number": 1,
+      "title": "章节标题",
+      "summary": "章节概要",
+      "plot_points": ["关键情节点"],
+      "characters_involved": ["涉及角色"]
+    }
+  ],
+  "themes": [
+    {
+      "theme": "主题名称",
+      "expression": "如何表达这个主题"
+    }
+  ]
+}