fix: address PR code review issues

1. Remove 现金分红-现金分红比例 from per_share aliases
   - It is a percentage field (e.g., 30%), not yuan-per-share
   - Adding it causes 10x inflation in dividend yield calculations

2. Preserve board membership lookup after ranking failures
   - Only skip belong_boards when boards_coverage is "not_supported"
   - Keep attempting membership lookup when ranking API returns "failed"
   - This ensures email sector metrics work even when rankings timeout

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: suan baby

data_provider/fundamental_adapter.py

@@ -27,7 +27,8 @@
         "派息(元/股)",
         "税前派息(元/股)",
         "现金分红(税前)",
-        "现金分红-现金分红比例",  # Added for stock_fhps_detail_em format
+        # Note: 现金分红-现金分红比例 is a percentage (e.g., 30%), not yuan-per-share
+        # Adding it here would cause 10x inflation in dividend yield calculations
     ],
     "plan_text": [
         "分配方案",

src/core/pipeline.py

@@ -731,16 +731,15 @@ def _attach_belong_boards_to_fundamental_context(
             market = get_market_for_stock(normalize_stock_code(code))
 
         # 对于美股和港股，强制尝试获取板块数据（不依赖 boards_status）
-        # 对于 A 股，使用原有逻辑
+        # 对于 A 股，只在明确 not_supported 时跳过（failed 应该尝试独立查询）
         if market in ("us", "hk"):
             # 美股/港股：直接获取板块数据
             pass  # 继续执行，不跳过
         elif (
             market not in ("cn", "us", "hk")
-            or boards_status in ("not_supported", "failed")
-            or boards_coverage in ("not_supported", "failed")
+            or boards_coverage in ("not_supported",)
         ):
-            # A 股：原有逻辑
+            # A 股：只有明确 not_supported 时才跳过
             enriched_context["belong_boards"] = []
             return enriched_context