fix: group 字段严格对齐 V1 market 字段值

修正分组命名，不再自行创造：
- CN_GROWTH/CN_VALUE → A
- US_TECH → US
- JP_BROAD → JP
- EU_BROAD → EU
- HK_BROAD/HK_TECH → HK
- FIXED_INCOME → BOND
- COMMODITY → COMMODITY (不变)

同步更新 market_overrides:
- CN_EQUITY → A
- HK_EQUITY → HK
- US_EQUITY → US

现在 group 字段完全映射 V1 的 market 字段值

framework_v2/strategies/rotation/config_simple.yaml

@@ -22,14 +22,14 @@ asset_pools:
     # 中国A股指数
     "399006.SZ":
       name: "创业板指"
-      group: "CN_GROWTH"
+      group: "A"
       signal_source: "399006.SZ"
       trade_source: "159915.SZ"
       description: "创业板指数"
     
     "H30269.CSI":
       name: "中证红利低波"
-      group: "CN_VALUE"
+      group: "A"
       signal_source: "H30269.CSI"
       trade_source: "512890.SH"
       description: "红利低波指数"
@@ -37,35 +37,35 @@ asset_pools:
     # 全球市场
     "NDX":
       name: "纳指100"
-      group: "US_TECH"
+      group: "US"
       signal_source: "NDX"
       trade_source: "513100.SH"
       description: "纳斯达克100指数"
     
     "N225":
       name: "日经225"
-      group: "JP_BROAD"
+      group: "JP"
       signal_source: "N225"
       trade_source: "513520.SH"
       description: "日经225指数"
     
     "GDAXI":
       name: "德国DAX"
-      group: "EU_BROAD"
+      group: "EU"
       signal_source: "GDAXI"
       trade_source: "513030.SH"
       description: "德国DAX指数"
     
     "HSI":
       name: "恒生指数"
-      group: "HK_BROAD"
+      group: "HK"
       signal_source: "HSI"
       trade_source: "159920.SZ"
       description: "恒生指数"
     
     "HSTECH.HK":
       name: "恒生科技"
-      group: "HK_TECH"
+      group: "HK"
       signal_source: "HSTECH.HK"
       trade_source: "513130.SH"
       description: "恒生科技指数"
@@ -100,7 +100,7 @@ asset_pools:
     # 注意：无对应ETF可交易，直接使用指数数据计算动量和收益
     "931862.CSI":
       name: "短债指数"
-      group: "FIXED_INCOME"
+      group: "BOND"
       signal_source: "931862.CSI"
       trade_source: "931862.CSI"
       description: "中证0-9个月国债指数，久期<1年，防御配置"
@@ -164,16 +164,16 @@ premium_control:
   
   # 按市场覆盖配置
   market_overrides:
-    CN_EQUITY:                  # A股 ETF
-      enabled: false            # 不启用（溢价通常 < 0.5%）
-    HK_EQUITY:                  # 港股 ETF
+    A:                        # A股 ETF
+      enabled: false          # 不启用（溢价通常 < 0.5%）
+    HK:                       # 港股 ETF
       enabled: true
-      threshold: 0.10           # 阈值 10%
-    US_EQUITY:                  # 美股 ETF
+      threshold: 0.10         # 阈值 10%
+    US:                       # 美股 ETF
       enabled: true
-      threshold: 0.10           # 阈值 10%
-    COMMODITY:                  # 商品 ETF
-      enabled: false            # 不启用
+      threshold: 0.10         # 阈值 10%
+    COMMODITY:                # 商品 ETF
+      enabled: false          # 不启用
 
 # ============================================================
 # 数据配置