chore: 知识库冷启动收尾 + CCA 大洋时间戳规则 + 依赖/文档同步

- CLAUDE.md 状态更新：知识库冷启动完成，下一步语义搜索
- backend/requirements.txt 增加 python-docx（doco 导入脚本依赖）
- CCA srt_writer 增加大洋"单下单上"40ms 间隔后处理
- Doco 寄存条状态更新为"已交付"

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cca/src/srt_writer.py

@@ -24,6 +24,27 @@ def ms_to_srt_time(ms: int) -> str:
     return f"{hours:02d}:{minutes:02d}:{seconds:02d},{millis:03d}"
 
 
+def _apply_dayang_timing(
+    subtitle_lines: List[Tuple[int, int, str]],
+) -> List[Tuple[int, int, str]]:
+    """
+    大洋"单下单上"：每条字幕的结束时间 = 下一条开始时间 - 40ms。
+    """
+    if len(subtitle_lines) <= 1:
+        return subtitle_lines
+
+    GAP_MS = 40
+    adjusted = []
+    for i, (start_ms, end_ms, text) in enumerate(subtitle_lines):
+        if i < len(subtitle_lines) - 1:
+            next_start = subtitle_lines[i + 1][0]
+            end_ms = next_start - GAP_MS
+            if end_ms < start_ms:
+                end_ms = start_ms
+        adjusted.append((start_ms, end_ms, text))
+    return adjusted
+
+
 def write_srt(
     subtitle_lines: List[Tuple[int, int, str]],
     output_path: str,
@@ -36,6 +57,8 @@ def write_srt(
     output_path: 输出文件路径
     time_offset: 时间偏移（用于正片拆分后各段从0开始计时的情况，这里不用，保持绝对时间）
     """
+    subtitle_lines = _apply_dayang_timing(subtitle_lines)
+
     with open(output_path, "w", encoding="utf-8") as f:
         for idx, (start_ms, end_ms, text) in enumerate(subtitle_lines, 1):
             start = ms_to_srt_time(start_ms - time_offset)